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Operating Your Sand Filter - The Pool Factory

Operating Your Sand Filter

The oldest and most popular method of filtration is sand. 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. Sand filters are the least expensive of the three types of filters but only filters particles down to 20 to 40 microns in size. Operating your sand filter would require some knowledge but still one of the easiest ways to keep your pool clean.

Tips to Remember

Always shut filter off before moving valve handle. Always backwash the filter immediately after adding new sand to the filter.

Starting the Filter System

Before plugging in filter, turn valve handle to the backwash setting. Water will begin to flow out of the backwash port plug in filter briefly until water begins to run clear. Unplug filter, turn valve handle to filter position and plug in filter. You are now filtering your pool water. Pressure reading on pressure gauge, will be between 6-12 psi. This initial pressure will be your normal operating pressure. When water return flow becomes weak or there is a surge in the pressure gauge reading it is time to backwash.

What is Backwashing?

Backwashing completely clears filter of all dirt& debris by reversing the flow of water through the filter. To backwash, simply unplug filter and move valve handle to the backwash position. Then plug in filter and let water run until clear. When water runs clear unplug filter, move valve handle back to the filter setting, and you are ready to filter again.

How Long Should Filter Run Each Day?

Most Sand Filters turn over approximately 2400 gallons per hour. It is recommended that you turn over the water in your pool at least twice a day. Run filter more in hot weather or with heavy bather load. As a general rule of thumb, turn your sand filter on 1 hour per 10° F of weather.

Pool Capacity Cheatsheet

Pool calculations have been rounded off to be used as a quick guide for easy pool maintenance.