Leave the cartridge out, and try it. If it's OK with no cartridge, replace the cartridge. If it's NOT OK, with no cartridge, you pretty much know the problem is not the filter.
Re: The return flow is very low in my in-ground pool
Leave the cartridge out, and try it. If it's OK with no cartridge, replace the cartridge. If it's NOT OK, with no cartridge, you pretty much know the problem is not the filter.
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