Your CSI is not in the aggressive region because of your TA and pH. Maintain a CSI of greater than -0.6 by not lowering your pH any more than to 7.8 when, and if, it reaches 8.
As the water warms, your CSI will naturally become more positive. So as your TA falls by adding acid to maintain your pH at 7.8, your CSI will be OK. Over summer, your evaporation will mean you are adding high CH fill water and thus, your CH in the pool water will rise. I suspect, by July, your CH will easily be 300 ppm.
Thanks guys. Water chemistry is a big deal for me. I have a special 6 year old that skin doesn’t fair so well in the HOA or water park chlorine pools, but he seems to do well in the grandparents SWG pool. I got to get, and keep this water right, I can’t handle him watching from the sidelines.
Your last CYA was in March and if you’ve gotten as much rain as we have down here that could’ve made it drift down some. I had some trouble with CYA testing in the beginning but found this pic that might help:
Quick question, I have been working on dialing in my chemistry. Starting with my low CYA numbers. Added 2 lbs of dry last weekend. I just read that CYA reading can be inaccurate in water temps below 70. Is this true?
(my Poolmath logs are linked to my profile, that's a cool little feature I just learned!)
Looking at your PoolMath logs (we can click on your Member Name and see your Logs) you are down 50 ppm CH. Are you using the 10 ml sample for testing? If so, there is error and thus you could be down just a touch on calcium because of any overflow from rain, but not much.
What is your fill water CH? You will soon have evaporation and have to add fill water.