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 Sand
filters are one of the most popular ways to filter water.
For good reasons. They are simple, effective, and require
very little attention. Pool water is routed through
a sand-filled pressure vessel.
Over time, dirt accumulates in the spaces between the
sand particles, causing the pressure in the vessel to
rise as water finds it harder to pass through. This
signals you to "backwash" the filter. Simply
reverse the water flow and "knock out" the
dirt. What could be simpler?
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