Green pool with clogged sand filter after 2 weeks out of town

[SunnyOptimism]

@jtran69,

I see you're in northern CA, are you able to drain and refill or are you still in water restrictions?

A CYA of 190ppm is really very high. During "normal" operation you'd need to maintain a minimum FC level of 14.2 just to keep algae at bay and your daily target level would have to be up around 20ppm somewhere just to ensure enough reserve disinfecting power. Dumping half your water and replacing would bring you back down to 95ppm CYA which would still be high but much more manageable from an FC perspective.

That's just my opinion. I had water that got up to 150ppm CYA and I gave up trying to fight that and just dumped half my water. Since then it's been a lot easier keeping my pool water balanced.

[jtran69]

We have to ration water and the yards on our street are mostly brown -- also washing your car is not allowed. I'm thinking to about fighting this hi cya til the end of the month and close the pool for the season.
I'm adding half gallon of bleach every night.