Return sending dirt back to pool

Curious, how old is your filter? You might try to capture some of the stuff blowing back from the returns. Place a nylon or sock over a return jet if you can next time you vacuum. Dirt will probably blow-out soft, but sand will be gritty. One other thing that helped some owners, even though you rinsed until clear, give it another 20-30 seconds from that point. See if that helps.
 
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