cloudy pool, not sure why?

[pairadocs]

saw it was cloudy yesterday - couldn't see the deep end.

chlorine was nonexistent - busy at work past 4 days - forgot to test water - my mistake!

so i added several gallons of chlorine overnight, now water reading are: using taylor drop kit

TC 5.6
FC 4.6
TA 50
CA 210
pH 7.0 (been running it low for a few weeks to try to reduce the scale)

35000 gal, concrete in ground pool with DE filter.

Just curious on your thoughts why it was cloudy? algae/microorgs/pollen?

 

[JasonLion]

Chlorine went to zero, cloudy pool, and CC is 1 says algae to me. Time to shock the pool. If you do it soon it will clear up more quickly than if you let it get all the way to the green swamp stage.

 

[pairadocs]

Chlorine went to zero, cloudy pool, and CC is 1 says algae to me. Time to shock the pool. If you do it soon it will clear up more quickly than if you let it get all the way to the green swamp stage.

thank jason, shocking now.

bob