Cloudy water returns after 2 days of clear water

[Frustrated pool boy]

I got my pool open with clear water after balancing and floc'ing. After 2-3 days of swimming and adding 2 lbs of PH rise, my water is cloudy again. Other chem's are in good range based on test strips. Do I need to floc again? Also, the pressure in my filter is running around 5 psi. Seems low to me. Is this a symptom of a filter problem?

[Daniel mc Daid]

this could be simple if your Ph is to high your pool can go clouldy check your levels. they should be around 7.2

[Frustrated pool boy]

Is 5 psi enough pressure to indicate the sand filter is working properly?