First off, I'd like to thank you all for contributing to this great community, I have learned many new tricks & tips just reading topics on this great discussion board.
So here's my problem. I have a 15000 gallon in-ground plaster pool that I recently converted from in-line chlorinator to SWG. The SWG I have chosen is the AutoPilot Pool Pilot Nano+ which I have been using for over a month and overall I am very pleased with its performance. My problem however is the PH that is climbing high, which is what I somehow expected after switching to SWG, but my problem is, it is climbing at very fast pace. If I balance the PH let's say on Sunday, getting it down to 7.3, 3 days later, on Wednesday my PH is back to 7.8, sometimes even 8.0. So I have to mess with Muriatic Acid twice a week, to keep my PH in desired levels, and honestly I am not very happy about it and trying to find a solution to stabilize it...
I went to our local Leslie's Pool store to discuss this issue and they suggested that my TA is way low (testing around 70ppm) and that is causing my PH being volatile. I am not sure about this and I'd like to hear some expert opinion about this.
On the other hand I have been reading many topics about adding borates to the pool, that among other benefits would help me with my PH issue and I would definitely go for it, the problem however is, that I have a 3 year old kid that swims with me in the pool every day, and I can tell he swallows significant amount of water each swimming session (sometimes I'd say even 16-20fl oz. of pool water). Even though I am doing my best to teach him not to do so, he does swallow sometimes unintentionally and I would be very worried about his health if I add borates. I have also an infant daughter, that I am not taking into our pool yet, but most likely will next season where she would be about 15months old, and that raises another concern, for her small body to deal with borates...
I'd like to get some insights from you pool experts, what are my options, options that would be safe for my kids and in the same time would make my PH more stable.
Thanks in advance!
Btw, here's my latest water test results:
PH: 7.3 (just poured HCL to get it down from 7.8)