You are correct at the pH test is invalid with a FC greater than 10 ppm.
That is the difficulty of trying to manage a pool with a very high CYA using liquid chlorine to sanitize.
Wait another hour or so and test the FC again as it should be below 10. Then test pH, adjust if necessary, and add LC to raise your FC to target level.
It's (my high CYA) from those darn trichlor tablets/pucks. I've already gave myself a warning since I was uneducated @ the time and didn't mean to use them intentionally lol
From what I've read on here, having CYA level of 80 might be okay in my case b/c the sun sets in my backyard so I direct sunlight all throughout the day and evening right before it gets dark. And I live in Houston, Tx where its reeeeeeally hot and humid.
Great you just jinx'd us knock on wood lol jk. Definitely don't want a hurricane. Harvey was a disaster. We get lots of rain here so I'm thinking of draining a few inches of water before it does. Does TFPC have a method of draining water? I didn't see a thread on the pool school section about it
My water level got low so I’m having to fill w the water hose while pump is off. I have an auto fill but dont like to use it bc it filters thru my water softener. I’ll turn the pump when water is up to level. How long after should I test and should I test for the 5 main chemicals or just FC n pH?
When your CH is near 400 you would be better off using your softened water for make up water in the future. Not for large drain/refills, just for evaporation.
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