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Next locate the pool filter. D.E. and cartridge filters can be easily maintained by you.
If you have a cartridge filter, remove the lid and examine the cartridge element. If it is discolored (not white) or has debris on it, then take your water hose and thoroughly spray it off to remove the debris.
If you have a D.E. filter, you will need to run the backwash procedure that your pool equipment installer should have showed you. If you do not know how to do this you can visit your pool filter manufacturer website for exact details.