Go to the back of the filter and unscrew the drain plug.
Swimming pool sand filter drain plug.
A sand filter needs backwashing when the pressure gauge reads 8 10 lbs higher than the pressure after cleaning.
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Later empty the filter if it is a diatomaceous earth de filter dry and store the filter elements or perhaps it is a sand filter.
Using the drain plug.
This will let all of the water drain out of the tank so make sure it is draining somewhere away from your pool that will not be affected by a lot of water.
Either will be recharged with water in the spring more below in the lower water and drain equipment.
If your filter is not the two piece type but has the small opening at the top of either the multiport valve or cover there are two ways to remove the sand.
Generally pool filter sand lasts about 5 7 years before it wears out and needs to be replaced except for very small filters used on aboveground pools which usually need new sand much sooner.
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If your multiport valve has a bleeder valve and a sight glass remove those too and store them in the pump.
Set your multiport valve to winterize and remove the drain plug at the bottom to allow the filter to drain completely.
Locate the drain plug near the bottom of your filter tank and unscrew it completely.
Turn the pump back on and let the water run until it reaches the point where you want to drain the water out.
This is while the pool is working.
Put the cap away in a safe place until the next time you open the pool.
Remove the drain plug and let the filter tank fully drain.
How to drain a pool with a cartridge filter.
You do not need to remove any sand from the filter.
The filter needs to be back washed repeatedly.
Shut off the pump.
Many swimming pool companies put the drain plugs for all the equipment items in the pump basket.
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Once you have pulled it apart it is an easy matter to dig out the sand.
For those pools that have a cartridge filter there are two ways to achieve this.
Pull the drain plug first to allow the water to drain before pulling the tank apart.
Pump preparation disconnect the drain plugs on your pump and put them in the pump basket.
The method you use for winterizing your above ground pool will depend on which type of filter you have.
Blow out the lines at the pool equipment use your air compressor or a shop vacuum to blow out the lines if possible and plug them.