2 part question here : since I live in the Sun's Anvil ( Phoenix AZ ) should I be targeting a higher CYA level than 50 to combat the sunshine ( bleach not SWG ) ?
Currently I am between 55 and 60 on my CYA ( closest readings I can get since CYA test is the most subjective one out there )
Full readings :
I figure that a CYA of 60 in Phoenix might not be a terribly bad thing, but have not been able to find anything other than the Pool School comment:
If you have a SWG or very high levels of direct sunlight, CYA is typically kept between 70 and 80.
Since I cannot imagine a place that has higher levels of direct sunlight, I'm guessing that my 60 CYA is just fine and I should not be looking to lower it as I had been. Similarly, however, it's probably not really worth taking effort to increase the CYA from 60 to 80 as I'll just be keeping a proportionately higher FC level than I already am.
Second question has to do with TA/CH/CSI, I've gotten My TA down from 190 to 120 but with my CH still up at 525, I'm still getting some scaling along the water line. I can continue to lower my TA but dont want to get it too low that I'll be swinging PH around alot, so I'm thinking of switching over to using a softened water line for my fill. Question here is : once I get my TA down to around 90, should I look at lowering my CH with soft-water to get my CSI level down? That assumes that CH can actually decrease like TA and not be just stuck like CYA. And embedded in that question would be : is my understanding that CH and TA kind of 'add' together to make CSI and increase the risk of scaling?