Hey everyone, first of all want to say what a great thing this forum is. I've been a "lurker" for a bit, trying to get an understanding of all that is pool. I've gotten a handle on the basics (pH, Chrloine, CYA) and upgraded my test kit, now I have a question on my high calcium levels...

My pool is 12,000 gallon PebbleTec with attached hot tub with an overflow into the pool. Aquarite SWG, located in Arizona.

Readings:
FC - 6
CYA - 80
pH - 7.3
TA - 110
Ca - 650
Salt - 3100

I recently drained and refilled half my pool to bring the salt level down (it was too high). Even after that I found my hardness to be at 650! I tested my fill water to be 200.

I have to keep some overflow on all the time, as it only runs on a single pump. Overwise I would get no circulation into the hot tub, or the hot tub drains out. Therefore, I am getting a good amount of aeration every day (pump runs 12 hrs/day) . I'm always adding muriatic acid to keep the pH down.

My understanding is, with that high calcium, I need to keep my pH and TA below average in order to avoid scaling, correct? I normally get a good amount of build up in the SWG in the summer and have to acid-wash. I also have gotten some scaling around the water line of the pool.

Am I correct? Am I ok with that Ca level provided I do this?

Thanks
Josh