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hayward sand filter not sure on model right now black cap on bottom of filter to drain water out to close down for winter took cap off just little water came out

took black cap off filter water not draining out what could be the prob.

i have a cheap test kit right now cl 5 ph 7.2 TA 150 cya 40 to 50 it has been blue and cloudy for about a week what do i need to adjust to get it to clear up i have a vinyl inground pool about 18,000 gallons with sand filter this is the first time i have really messed with a pool it started off...