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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...