Trouble with low water return

Above ground pool new pump 1yr old filter and cartridge looked for air leak so far . When you start the pump it runs great for about 20 minutes then it slows down I clean cartridge replace runs great and repeats the same thing I can’t vaccum no suction if I take the cartridge out to clean it it also goes back to normal if the cartridge is not in the filter I’m lost please help me I have to fix it every 20 minutes

We’d be glad to assist you. Is the pool water clear or is it cloudy/green?

If the pool water is clear, the cartridge could be packed with oils that can’t be removed from a normal hose down. We’d recommend soaking the cartridge in a filter cleaner. If the problem persists, you may need to replace the cartridge.

Thank you so much I will try that

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You’re welcome. Come back and let us know how things turn out.