133 Blakely Road
Colchester, VT 05446

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Sand Filters

The oldest and most popular method of filtration is sand. Sand filters share two things in common:
1) When in the filtration mode, water always flows from top to bottom;
2) They all have some sort of lateral or underdrain with slots to hold back sand while allowing clean, filtered water to pass through.

High-rate sand filters use a special filter sand, normally .45 to .55 mm (also known as pool grade #20 silica sand), because it has sharp edges that serve to separate particles, allowing filtration to take place. They operate on the basis of "depth" filtration; dirt is driven through the sand bed and trapped in the minute spaces between the particles of sand. Initially, a clean sand bed will remove larger particles, and then, as the bed starts to load up with dirt, it will remove finer particles.

Cleaning of the media, or sand, is accomplished through reversing the flow through the filter, to the "waste" line. This is known as backwashing.


1. Flange Clamp Design
allows 360° rotation of valve to simplify plumbing.

2. Integral Top Diffuser
ensures even distrubution of water over th top of the sand media bed. Full-size internal piping gives a smooth, free-flowing performance.

3. Unitized, Corrosion-Proof Filter Tank
molded of tough, durable colorfast polymeric material for dependable, all-weather performance with only minimal car.

4. Efficient, Multi-Lateral Underdrain Assembly
with precision engineered, self-cleaning 360° slotted laterals gives totally balanced flow of sand.

5. Integral Molded Drain Plug
for easy draining of tank, without the loss of sand.

6. Totally Corrosion-Proof Base
Is rugged and attractively styled to provide strong, stable support.

Side Mount Valve

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Top Mount Valve

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