Operating Your Sand Filter

Here are a few tips to remember before you get started operating your sand filter system.


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.

Here are a few tips to remember before you get started Operating Your Sand Filter:

  • Always shut filter off before moving valve handle. (Valve handle will be seriously damaged if you do not.)
  • Always backwash the filter immediately after adding new sand to the filter.

Starting the Filter System

Before plugging in filter, turn valve handle (located on top of filter) to the backwash setting. Water will begin to flow out of the backwash port plug in filter briefly until water begins to run clear. (if you need to send backwash water a longer distance, backwash hoses are available in 25, 50, 100 & 200ft lengths). 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 (refer to chart at bottom of page for your pools capacity). 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 Size Capacity (Gal.) Pool Size Capacity (Gal.) 
12 Round3,0008x12/14 Oval2,500
15 Round5,0008x15/16 Oval3,000
18 Round7,5008x19 Oval3,500
21 Round10,00010x15/16 Oval3,500
24 Round13,00010x18/19 Oval4,000
27 Round17,00010x21 Oval5,000
30 Round21,00012x16 Oval4,500
33 Round25,00012x17/18 Oval5,000
12x20/21 Oval6,500
12x24/27 Oval7,500
14x20 Oval7,500
15x23/24 Oval8,500
15x26 Oval9,000
15x30 Oval10,500
16x32 Oval12,000
18x33 Oval14,000
18x40 Oval17,000
21x43 Oval24,000

Please note: Pool calculations below have been rounded off to be used as a quick guide for easy pool maintenance. For exact calculations please use our pool volume calculator.

AquaPro 24" Sand Filter System 2-HP 2-Speed Pump 2 Year Warranty

The AquaPro 24″ master series is a high-rate sand filter that offers leading edge technology for unparalleled efficiency, flow and serviceability. The 7-way valve provides simple operation and dependability. The compact design, along with maximum filtering capability, reduces maintenance and time.

AquaPro 24