The filter needs to be back washed repeatedly.
Swimming pool sand filter drain plug.
Either will be recharged with water in the spring more below in the lower water and drain equipment.
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.
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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For those pools that have a cartridge filter there are two ways to achieve this.
This is while the pool is working.
Put the cap away in a safe place until the next time you open the pool.
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.
This is a two person job.
Remove the drain plug and let the filter tank fully drain.
Your sand filter system s sand is good for about 4 5 years.
Turn the pump back on and let the water run until it reaches the point where you want to drain the water out.
The method you use for winterizing your above ground pool will depend on which type of filter you have.
Using the drain plug.
Many swimming pool companies put the drain plugs for all the equipment items in the pump basket.
Pull the drain plug first to allow the water to drain before pulling the tank apart.
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.
Pump preparation disconnect the drain plugs on your pump and put them in the pump basket.
Go to the back of the filter and unscrew the drain plug.
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.
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.
How to drain a pool with a cartridge filter.
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Shut off the pump.
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.
If your multiport valve has a bleeder valve and a sight glass remove those too and store them in the pump.