Depending on the type of water, suspended solids concentration, oil and grease, COD/ BOD, iron contents, sand filters are sized differently, but the basic design data to clarify natural waters are the following: Filtration velocity 6-15 m3/h.m2 Diameter 50 cm to 1m 1 to 3m Filtration area 0,2 to 0,8 m2 0,8 to 7 m2 Flowrates 10L/h to 10 m3/h 10 to 100 m3/h Pressure ratings 4 to10 bar Vessel Materials Epoxy-coated steel   Polyester composite   Stainless steel (on request) Bed depth 1 meter min. Filtration media Anthracite 1.4-1.5 mm   Sand 0.4-0.8 mm   Sand 1.0-2.0 mm   Gravel 2.0-3.15 mm   Gravel 3.15-5.6 mm Top manhole 2 1/2 to 6" DN 400 Accessories 5-ball or butterfly valves 5-butterfly valves Options Manometers, degaser, flowmeter Control Automatic or manual backwash, on timer and/or differential pressure More on sand filtration

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