Do you mean that the vac is not picking up the dirt? Do you mean to say that the dirt is returning to the pool via the return lines? 1st question: properly hook up your vac hose and vac head and/or turn on the pump. 2nd question: There is a damaged grid in the D E filter; Wrong type of filter media in a sand filter; Damaged element in a cartridge filter or overpumped- pump is too strong for the system.
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