Go to the back of the filter and unscrew the drain plug.
Swimming pool sand filter drain plug.
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Set your multiport valve to winterize and remove the drain plug at the bottom to allow the filter to drain completely.
The filter needs to be back washed repeatedly.
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.
Pump preparation disconnect the drain plugs on your pump and put them in the pump basket.
To do this simply unscrew and remove the drain cap on the bottom of the filter barrel.
A sand filter needs backwashing when the pressure gauge reads 8 10 lbs higher than the pressure after cleaning.
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.
Turn the pump back on and let the water run until it reaches the point where you want to drain the water out.
You do not need to remove any sand from the filter.
Remove the drain plug and let the filter tank fully drain.
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.
Shut off the pump.
Either will be recharged with water in the spring more below in the lower water and drain equipment.
Using the drain plug.
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For those pools that have a cartridge filter there are two ways to achieve this.
If your multiport valve has a bleeder valve and a sight glass remove those too and store them in the pump.
How to drain a pool with a cartridge filter.
This is a two person job.
Pull the drain plug first to allow the water to drain before pulling the tank apart.
Locate the drain plug near the bottom of your filter tank and unscrew it completely.
Many swimming pool companies put the drain plugs for all the equipment items in the pump basket.
Put the cap away in a safe place until the next time you open the pool.
Once you have pulled it apart it is an easy matter to dig out the sand.
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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.
This is while the pool is working.