Slow sand filter hi-res stock photography and images

water intake of a biological slow sand filter, Germany Stock Photo

RMEBKWN1–water intake of a biological slow sand filter, Germany

Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine Stock Photo

RM2NFFBM0–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

Sea cucumber are slow moving bottom feeder that filter out decaying plant and animal materials from the sand bottom. Stock Photo

RMC300KH–Sea cucumber are slow moving bottom feeder that filter out decaying plant and animal materials from the sand bottom.

Firth of Clyde sunset looking to Ailsa Craig from Ayr beach, Scotland, UK. Stock Photo

RMDM8KYH–Firth of Clyde sunset looking to Ailsa Craig from Ayr beach, Scotland, UK.

Isolated rock on a beach. Long esposure gives a silky smooth sea and misty appearance. Stock Photo

RF2NRKAG5–Isolated rock on a beach. Long esposure gives a silky smooth sea and misty appearance.

Kogel Bay is on the Indian Ocean between Gordon's Bay and Rooi Els and features kilometers of undeveloped sandy beach amid mountains and fynbos Stock Photo

RFRF4N13–Kogel Bay is on the Indian Ocean between Gordon's Bay and Rooi Els and features kilometers of undeveloped sandy beach amid mountains and fynbos

After sunset on Sunset Beach in Hawaii Stock Photo

RF2HXDRTN–After sunset on Sunset Beach in Hawaii

BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING SOUTHWEST. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ Stock Photo

RMWA1N4N–BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING SOUTHWEST. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

Vintage beach scene in sunset, slow shutter with moving waves. Stock Photo

RFEN0G17–Vintage beach scene in sunset, slow shutter with moving waves.

A coastal long exposure scene with sea, sun sand and rock in black and white, near Caswell Bay on the Gower Peninsula in Wales, UK Stock Photo

RFK0EN07–A coastal long exposure scene with sea, sun sand and rock in black and white, near Caswell Bay on the Gower Peninsula in Wales, UK

Filtered effect vintage photo, sunset at beach. Water flowing in slow motion, rocky shore and golden sand. Stock Photo

RFFWA402–Filtered effect vintage photo, sunset at beach. Water flowing in slow motion, rocky shore and golden sand.

Ynys Lochtin from Tresaith Beach, Aberporth, Wales Stock Photo

RM2E8M4YG–Ynys Lochtin from Tresaith Beach, Aberporth, Wales

Long exposure of a groyne on Bournemouth Beach at sunset Stock Photo

RMHHT4XM–Long exposure of a groyne on Bournemouth Beach at sunset

RFJC31FR–Vintage beach scene in sunset, slow shutter with moving waves.

Worthing Pier at sunrise - Worthing, West Sussex, England, UK Stock Photo

RMAAE4T0–Worthing Pier at sunrise - Worthing, West Sussex, England, UK

Sunset at Avlonas beach, very close to Myrina town, Lemnos (Limnos) island, North Aegean, Greece. Stock Photo

RMEP4DAW–Sunset at Avlonas beach, very close to Myrina town, Lemnos (Limnos) island, North Aegean, Greece.

Orange sunset and smooth waves across the sandy beach of Widemouth bay, Cornwall Stock Photo

RFJEF0H7–Orange sunset and smooth waves across the sandy beach of Widemouth bay, Cornwall

Karang beach, Sanur, Bali - Indonesia - Fujifilm X-T1 Samyang 12mm f/2.0 NCS CS @f/5.6 Lee 0.6 hard GND Haida ND1000 Stock Photo

RF2WD0WMK–Karang beach, Sanur, Bali - Indonesia - Fujifilm X-T1 Samyang 12mm f/2.0 NCS CS @f/5.6 Lee 0.6 hard GND Haida ND1000

Nature view during sunset at Green Valley of Jeddah, Saudi Arabia Stock Photo

RF2HD2684–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

RMEBKWN4–water intake of a biological slow sand filter, Germany

RM2NFEXPD–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

RF2WD0WMM–Karang beach, Sanur, Bali - Indonesia - Fujifilm X-T1 Samyang 12mm f/2.0 NCS CS @f/5.6 Lee 0.6 hard GND Haida ND1000

RFWKM08R–Vintage beach scene in sunset, slow shutter with moving waves.

Llangrannog, Ceredigion, West Wales Stock Photo

RMRCAJH4–Llangrannog, Ceredigion, West Wales

Kogel Bay is on the Indian Ocean between Gordon's Bay and Rooi Els and features several kilometers of undeveloped sandy beach amid mountains and fynbo Stock Photo

RFKY6H52–Kogel Bay is on the Indian Ocean between Gordon's Bay and Rooi Els and features several kilometers of undeveloped sandy beach amid mountains and fynbo

. The sanitation of cities. usual. The sand grains are coarser,and the bed of sand is cleaned in place, by revers-ing the direction of flow—so that filtered water isforced back through the filter bed. The rawwater is first clarified by the addition of the coagu-lants, and after sedimentation in a tank, is passedto the surface of the bed, over which the coagu-lant causes the rapid formation of a gelatinousfilm, and is allowed to pass downward throughthis and the sand at a rate about forty timesgreater than the slow sand filter would permit.Rates of 100,000,000 to 125,000,000 gallons aday to the Stock Photo

RM2AFKM82–. The sanitation of cities. usual. The sand grains are coarser,and the bed of sand is cleaned in place, by revers-ing the direction of flow—so that filtered water isforced back through the filter bed. The rawwater is first clarified by the addition of the coagu-lants, and after sedimentation in a tank, is passedto the surface of the bed, over which the coagu-lant causes the rapid formation of a gelatinousfilm, and is allowed to pass downward throughthis and the sand at a rate about forty timesgreater than the slow sand filter would permit.Rates of 100,000,000 to 125,000,000 gallons aday to the

RMWA1N3N–BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING SOUTHWEST. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

Mature sea cucumber on the sea floor feeding Stock Photo

RF2HE8P4K–Mature sea cucumber on the sea floor feeding

Mahaulepu Beach on the Hawaiian Island of Kauai Stock Photo

RMT9MWCP–Mahaulepu Beach on the Hawaiian Island of Kauai

A slowly exposed, moody view of large stones in the water behind Chesil Beach Stock Photo

RFT2BR50–A slowly exposed, moody view of large stones in the water behind Chesil Beach

RFRWWH96–Togetherness

Long exposure of Bournemouth Beach Groyne at sunset Stock Photo

RMHHT4XE–Long exposure of Bournemouth Beach Groyne at sunset

Professional Videographer Holding DSLR Camera on 3-axis Gimbal Stabilization Device in Winter. Cinematographer Operator. Slow Motion Stock Photo

RF2HAX9BK–Professional Videographer Holding DSLR Camera on 3-axis Gimbal Stabilization Device in Winter. Cinematographer Operator. Slow Motion

RMAAE4TD–Worthing Pier at sunrise - Worthing, West Sussex, England, UK

RMEP4DAY–Sunset at Avlonas beach, very close to Myrina town, Lemnos (Limnos) island, North Aegean, Greece.

Turtle illustration. Animal, shell, paws, head. Editable vector graphic design. Stock Vector

RF2R29X9Y–Turtle illustration. Animal, shell, paws, head. Editable vector graphic design.

RF2HD2687–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

RMEBKWMY–water intake of a biological slow sand filter, Germany

RM2NFF4NB–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

grassland and disused biological slow sand filter for water collection at the Ruhr river bank, Germany Stock Photo

RMFJ6A2A–grassland and disused biological slow sand filter for water collection at the Ruhr river bank, Germany

RMRCAFAY–Llangrannog, Ceredigion, West Wales

. Preventive medicine and hygiene. er water through sand was in 1829 whenthe one-acre slow sand filter was built by James Simpson for the East ChelseaWater Co., at London, England. In 1872 a plant was built at Poughkeepsie,N. Y., in accordance with plans prepared by Mr. James P. Kirkwood, whichwas the first practical attempt at purification of a municipal water supplyin America. 884 THE PUEIFICATION OF WATER are spoken of as the American method, because this process was de-veloped in this coimtry to meet our special needs. The student shouldhave a clear comprehension of the differences between Stock Photo

RM2AFJ4XW–. Preventive medicine and hygiene. er water through sand was in 1829 whenthe one-acre slow sand filter was built by James Simpson for the East ChelseaWater Co., at London, England. In 1872 a plant was built at Poughkeepsie,N. Y., in accordance with plans prepared by Mr. James P. Kirkwood, whichwas the first practical attempt at purification of a municipal water supplyin America. 884 THE PUEIFICATION OF WATER are spoken of as the American method, because this process was de-veloped in this coimtry to meet our special needs. The student shouldhave a clear comprehension of the differences between

BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING WEST. THE NONHISTORIC CHEMICAL BUILDING IS SEEN IN THE BACKGROUND. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ Stock Photo

RMWA1N3T–BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING WEST. THE NONHISTORIC CHEMICAL BUILDING IS SEEN IN THE BACKGROUND. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

RMT9MWH4–Mahaulepu Beach on the Hawaiian Island of Kauai

Into the sun on Bournemouth Beach at sunset Stock Photo

RMHHT4XA–Into the sun on Bournemouth Beach at sunset

RMAAE4W0–Worthing Pier at sunrise - Worthing, West Sussex, England, UK

RMEP4DAG–Sunset at Avlonas beach, very close to Myrina town, Lemnos (Limnos) island, North Aegean, Greece.

brighton west pier and beach at sunrise Stock Photo

RMHDGGPT–brighton west pier and beach at sunrise

Turtle sticker illustration. Animal, shell, paws, head. Editable vector graphic design. Stock Vector

RF2WH17HK–Turtle sticker illustration. Animal, shell, paws, head. Editable vector graphic design.

RF2HD269R–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

RM2NFFMM3–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

RMRCAFAG–Llangrannog, Ceredigion, West Wales

. Typhoid fever; its causation, transmission and prevention . beds in the winter on accountof ice. The filter was designed also to operate inter-mittently instead of continuously. Albany, N.Y. The filter at Albany, constructed in1889 to purify the water of the Hudson River, pollutedby the sewage of Troy, Cohoes, Schenectady, and manyother cities, represents the type of filter which has sincebeen largely used in this country. It followed Europeanpractice more closely than that at Lawrence. It is asand filter, or a slow sand filter, as it is oftencalled, and consists of a large area of sand four Stock Photo

RM2CHNM86–. Typhoid fever; its causation, transmission and prevention . beds in the winter on accountof ice. The filter was designed also to operate inter-mittently instead of continuously. Albany, N.Y. The filter at Albany, constructed in1889 to purify the water of the Hudson River, pollutedby the sewage of Troy, Cohoes, Schenectady, and manyother cities, represents the type of filter which has sincebeen largely used in this country. It followed Europeanpractice more closely than that at Lawrence. It is asand filter, or a slow sand filter, as it is oftencalled, and consists of a large area of sand four

VIEW LOOKING SOUTHEAST TOWARD WEST SIDE OF SETTLING RESERVOIR NO. 1. THE BLAISDELL SLOW SAND FILTER WASHING MACHINE IS SEEN AT THE LEFT. MAIN STREET IS IN THE FOREGROUND. - Yuma Main Street Water Treatment Plant, Jones Street at foot of Main Street, Yuma, Yuma County, AZ Stock Photo

RM2A55TRG–VIEW LOOKING SOUTHEAST TOWARD WEST SIDE OF SETTLING RESERVOIR NO. 1. THE BLAISDELL SLOW SAND FILTER WASHING MACHINE IS SEEN AT THE LEFT. MAIN STREET IS IN THE FOREGROUND. - Yuma Main Street Water Treatment Plant, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

RMAAE4W1–Worthing Pier at sunrise - Worthing, West Sussex, England, UK

RMEP4DB1–Sunset at Avlonas beach, very close to Myrina town, Lemnos (Limnos) island, North Aegean, Greece.

brighton west pier beach at sunrise Stock Photo

RMHDGGR5–brighton west pier beach at sunrise

RF2HD2686–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

Brighton Beach and Palace Pier seascape in black and white Stock Photo

RMHDMXDD–Brighton Beach and Palace Pier seascape in black and white

RM2NFERPK–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

RMRCAF9Y–Llangrannog, Ceredigion, West Wales

. History of the Medical Society of the District of Columbia, 1817-1909. iltration in their rela-tion to the public water supply of this District, by thecourtesy of Gen. John M. Wilson, Chief of Engineers, U.S. A., visited the experimental plant established by Colo-nel Miller and found the filters as described above. Themechanical filter was the very best that could be made,while the slow sand filter was necessarily merely in minia-rture of what it would be when in practical use. The pro-duct of the mechanical filter was a beautiful and clearwater; that of the slow sand filter was not quite so Stock Photo

RM2CENT9M–. History of the Medical Society of the District of Columbia, 1817-1909. iltration in their rela-tion to the public water supply of this District, by thecourtesy of Gen. John M. Wilson, Chief of Engineers, U.S. A., visited the experimental plant established by Colo-nel Miller and found the filters as described above. Themechanical filter was the very best that could be made,while the slow sand filter was necessarily merely in minia-rture of what it would be when in practical use. The pro-duct of the mechanical filter was a beautiful and clearwater; that of the slow sand filter was not quite so

BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING NORTHWEST. PIPING IN FOREGROUND IS NOT RELATED TO THE MACHINE. THE NORTHEAST CORNER OF SETTLING RESERVOIR NO. 3 IS SEEN AT THE LOWER LEFT. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ Stock Photo

RMWA1MTR–BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING NORTHWEST. PIPING IN FOREGROUND IS NOT RELATED TO THE MACHINE. THE NORTHEAST CORNER OF SETTLING RESERVOIR NO. 3 IS SEEN AT THE LOWER LEFT. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

RMAAE4T3–Worthing Pier at sunrise - Worthing, West Sussex, England, UK

RMEP4DAR–Sunset at Avlonas beach, very close to Myrina town, Lemnos (Limnos) island, North Aegean, Greece.

RF2HD268B–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

Brighton Beach and West Pier seascape in black and white Stock Photo

RMHDMXDC–Brighton Beach and West Pier seascape in black and white

RM2NFFA9A–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

Boscombe Pier in Black and White Stock Photo

RMHDMXD7–Boscombe Pier in Black and White

RMRCAF92–Llangrannog, Ceredigion, West Wales

Tresaith Beach, Aberporth, Ceredigion, West Wales Stock Photo

RM2E386FN–Tresaith Beach, Aberporth, Ceredigion, West Wales

VIEW LOOKING EAST. THE NORTH WALL OF SETTLING RESERVOIR NO. 3 IS AT THE LEFT. THE BLAISDELL SLOW SAND FILTER WASHING MACHINE IS SEEN AT THE UPPER LEFT AND SETTLING RESERVOIR NO. 4 IS SEEN BEYOND THE EAST WALL OF SETTLING RESERVOIR NO. 3. - Yuma Main Street Water Treatment Plant, Jones Street at foot of Main Street, Yuma, Yuma County, AZ Stock Photo

RM2A55TRP–VIEW LOOKING EAST. THE NORTH WALL OF SETTLING RESERVOIR NO. 3 IS AT THE LEFT. THE BLAISDELL SLOW SAND FILTER WASHING MACHINE IS SEEN AT THE UPPER LEFT AND SETTLING RESERVOIR NO. 4 IS SEEN BEYOND THE EAST WALL OF SETTLING RESERVOIR NO. 3. - Yuma Main Street Water Treatment Plant, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

Practical preventive medicine . apid Sand Filtration.—-This is accomplished by two typesof filters, either pressure or gravity, according to the mannerin which the head of water is secured upon the filter. Theoperation of each is based upon the same principle. Thismethod requires only a small installation, with a low initialcost, but a high cost of maintenance. They are very efficient WATER PURIFICATION J37 in the removal of color and turbidity, and slightly less efficient(95 per cent, to 99 per cent.) and less uniform in the degree ofbacterial removal secured as compared with slow sand niters Stock Photo

RM2AJEJ8D–Practical preventive medicine . apid Sand Filtration.—-This is accomplished by two typesof filters, either pressure or gravity, according to the mannerin which the head of water is secured upon the filter. Theoperation of each is based upon the same principle. Thismethod requires only a small installation, with a low initialcost, but a high cost of maintenance. They are very efficient WATER PURIFICATION J37 in the removal of color and turbidity, and slightly less efficient(95 per cent, to 99 per cent.) and less uniform in the degree ofbacterial removal secured as compared with slow sand niters

RMAAE4TA–Worthing Pier at sunrise - Worthing, West Sussex, England, UK

RMEP4DB2–Sunset at Avlonas beach, very close to Myrina town, Lemnos (Limnos) island, North Aegean, Greece.

RF2HD269M–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

RM2NFFJ22–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

Bournemouth Groyne in Black and White Stock Photo

RMHDMXDB–Bournemouth Groyne in Black and White

black and white seascape with sea defenses Stock Photo

RMHE4YNF–black and white seascape with sea defenses

RM2E386B1–Tresaith Beach, Aberporth, Ceredigion, West Wales

VIEW LOOKING NORTHWEST TOWARD SOUTHEAST CORNER OF SETTLING RESERVOIR NO. 3. THE SOUTHWEST CORNER OF SETTLING RESERVOIR NO. 1 IS AT THE FAR LEFT. THE BLAISDELL SLOW SAND FILTER WASHING MACHINE IS SEEN AT THE RIGHT. THE SOUTHERN PACIFIC RAILROAD RESERVOIR IS SEEN ON THE HORIZON AT LEFT. JONES STREET IS IN THE FOREGROUND. - Yuma Main Street Water Treatment Plant, Jones Street at foot of Main Street, Yuma, Yuma County, AZ Stock Photo

RM2A55TRF–VIEW LOOKING NORTHWEST TOWARD SOUTHEAST CORNER OF SETTLING RESERVOIR NO. 3. THE SOUTHWEST CORNER OF SETTLING RESERVOIR NO. 1 IS AT THE FAR LEFT. THE BLAISDELL SLOW SAND FILTER WASHING MACHINE IS SEEN AT THE RIGHT. THE SOUTHERN PACIFIC RAILROAD RESERVOIR IS SEEN ON THE HORIZON AT LEFT. JONES STREET IS IN THE FOREGROUND. - Yuma Main Street Water Treatment Plant, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

. The sanitation of cities. medium fine screen-ing. The Hamburg sewage screen plant hasscreens with A inch clear openings. Altonauses coarse screens for part of its sewage dis-charge, but for the major part provides no treat-ment whatever, depending entirely on water puri-fication for the safety of its water supply. Out of the English practice two types of filtershave been developed for water treatment. Theseare usually named from their most salient fea-tures, slow sand filters, and rapid sand filters. Theearlier installations were all slow sand filters. A slow sand water filter consists of a Stock Photo

RM2AFKME2–. The sanitation of cities. medium fine screen-ing. The Hamburg sewage screen plant hasscreens with A inch clear openings. Altonauses coarse screens for part of its sewage dis-charge, but for the major part provides no treat-ment whatever, depending entirely on water puri-fication for the safety of its water supply. Out of the English practice two types of filtershave been developed for water treatment. Theseare usually named from their most salient fea-tures, slow sand filters, and rapid sand filters. Theearlier installations were all slow sand filters. A slow sand water filter consists of a

RMAAE4W6–Worthing Pier at sunrise - Worthing, West Sussex, England, UK

RMEP4DAM–Sunset at Avlonas beach, very close to Myrina town, Lemnos (Limnos) island, North Aegean, Greece.

RF2HD269P–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

RM2NFF255–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

RMHE4YNG–black and white seascape with sea defenses

RM2E386DW–Tresaith Beach, Aberporth, Ceredigion, West Wales

BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING SOUTH. THE OUTSIDE FACE OF THE NORTH WALL OF SETTLING RESERVOIR NO. 3 IS SEEN AT THE RIGHT. THE SETTLING RESERVOIR IS ELEVATED ABOVE THE FILTERING RESERVOIR TO ACHIEVE GRAVITY WATER FLOW FROM THE SETTLING RESERVOIR INTO THE FILTERING RESERVOIR. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ Stock Photo

RMWA1MW2–BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING SOUTH. THE OUTSIDE FACE OF THE NORTH WALL OF SETTLING RESERVOIR NO. 3 IS SEEN AT THE RIGHT. THE SETTLING RESERVOIR IS ELEVATED ABOVE THE FILTERING RESERVOIR TO ACHIEVE GRAVITY WATER FLOW FROM THE SETTLING RESERVOIR INTO THE FILTERING RESERVOIR. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

A manual of hygiene and sanitation . Glass model of Loomls-Manning filter, showing filter in action. several days. Stone filters may be good, and resemblethe porcelain ones in action, but are apt to be slow and MATERIALS USED AS FILTERING MEDIA, 203 must be cleansed often. Sharp, clean sand, not too fine,has fair filtering properties, as it arrests most of the sus- FiG. 44.. Glass model of Loomis-Mannlng filter, showing self-scouriug of material during cleansing. pended matters and bacteria, beside oxidizing somewhatthe dissolved organic matters. It makes a good first layer 204 WATER. for a fi Stock Photo

RM2AJE347–A manual of hygiene and sanitation . Glass model of Loomls-Manning filter, showing filter in action. several days. Stone filters may be good, and resemblethe porcelain ones in action, but are apt to be slow and MATERIALS USED AS FILTERING MEDIA, 203 must be cleansed often. Sharp, clean sand, not too fine,has fair filtering properties, as it arrests most of the sus- FiG. 44.. Glass model of Loomis-Mannlng filter, showing self-scouriug of material during cleansing. pended matters and bacteria, beside oxidizing somewhatthe dissolved organic matters. It makes a good first layer 204 WATER. for a fi

RMAAE4T7–Worthing Pier at sunrise - Worthing, West Sussex, England, UK

Worthing Pier (part) - Worthing, West Sussex, England, UK Stock Photo

RMAAE4P8–Worthing Pier (part) - Worthing, West Sussex, England, UK

RF2HD2688–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

Worthing Pier at low tide at sunrise - Worthing, West Sussex, England, UK Stock Photo

RMAAE4P1–Worthing Pier at low tide at sunrise - Worthing, West Sussex, England, UK

RM2NFFC0M–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

RM2E386B7–Tresaith Beach, Aberporth, Ceredigion, West Wales

BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING SOUTHEAST. THE ELECTRIC TROLLEY IS SEEN AT THE LEFT. THE BULKHEAD SEEN AT THE LOWER RIGHT IS NOT PART OF THE MACHINE; IT WAS INSTALLED TO RETAIN THE FILTER SAND AFTER THE MACHINE WAS NO LONGER USED. THE NORTHWEST CORNER OF SETTLING RESERVOIR NO. 4 IS SEEN IN THE DISTANCE BELOW THE RIGHT SIDE OF THE TROLLEY. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ Stock Photo

RMWA1MW0–BLAISDELL SLOW SAND FILTER WASHING MACHINE. VIEW LOOKING SOUTHEAST. THE ELECTRIC TROLLEY IS SEEN AT THE LEFT. THE BULKHEAD SEEN AT THE LOWER RIGHT IS NOT PART OF THE MACHINE; IT WAS INSTALLED TO RETAIN THE FILTER SAND AFTER THE MACHINE WAS NO LONGER USED. THE NORTHWEST CORNER OF SETTLING RESERVOIR NO. 4 IS SEEN IN THE DISTANCE BELOW THE RIGHT SIDE OF THE TROLLEY. - Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine, Jones Street at foot of Main Street, Yuma, Yuma County, AZ

RF2HD2689–Nature view during sunset at Green Valley of Jeddah, Saudi Arabia

RMAAE4P3–Worthing Pier at low tide at sunrise - Worthing, West Sussex, England, UK

RM2NFEJ0G–Yuma Main Street Water Treatment Plant, Blaisdell Slow Sand Filter Washing Machine

Slow sand filter Stock Photos and Images

Slow sand filter Stock Photos and Images

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