I've bought and moved into a house with a 1,800 gal swim spa, and I'm getting the parameters under control from some issues that existed when I moved in (eg FC over 100, but that's a whole different story!).
After reading through the recommendations in the spa sticky on how to use chlorine, (as well as LOTS of other stuff here on TFP) I just have one question.
Using the recommended parameters in How do I use Chlorine in my Spa (or pool)? , and plugging the numbers into poolmath, everything seems reasonable if the salt level is low. However my spa has an SWG. If I put the recommended 4,500ppm salt into poolmath, it takes the CSI down below -0.6.
I don't want to raise the TA to much as I understand that will cause pH rises with the aeration. Should I increase the CH to compensate and raise the CSI? Or doesn't the CSI matter? The pool has an acrylic surface so the CSI shouldn't affect it, but some other threads indicate that there may be an issue with ceramic components in the heater/pumps?
Your thoughts would be appreciated.