What an amazing resource TFP has been. Quickly fell into problems with CYA after pool opened last August. Drained and refilled 1/3 to bring CYA down to ~55. Fired pool service. Fired Leslie's (will never go there again, for ANYTHING). Learned everything I know from TFP and things have gone swimmingly. Why is it I feel I know more than the service companies?
I will be in and out of town on business most of the summer and have no choice but to hire a service company (ASP-Mesa). I did much research and liked the reviews they got on Google, and the way they handled complaints. Last week was our first service. I had just added some baking soda to bring the TA up a bit. Naturally the pH went up. I planned to bring it into balance the following day, when I got a call from P-tech saying he was on his way (a day early). So I thought I'd let him do it. I warned him it was high. (It was -maybe- a little above 8)
He dumped 1.5 gallons of MA (31.45 baume) into my pool. In the same spot. I had a heart attack, but figuring he knew what he was doing, I let it go even though I'd never needed that much to bring it in balance.
He thought it would bring it to 7.0 or 7.1. I tested after he left and it took 12 drops of acid demand to get it to a 7. And now the TA was 60. I added 5# baking soda and added ~2 inches of water with a spray hose to create some aeration. pH was now roughly 6.6. TA was 140. Like swimming in 7-Up, only less pleasant.
pH ticked up throughout the week. was above 8 on 5th day. Added 4ppm FC. + 4 doses of MA--I wanted pH to be around 7 (actual probably 7.2 TA=130 FC=6) when he came back, because I did not want him thinking he needed to add another gallon of MA. I just checked it again today, (the 8th day. Ptech to come today) and it was again 8. I've always had a bit of a pH up-bounce. Figure it is the liquid chlorine and nature of AZ water. But it has never been so dramatic. 7.2 to 8+ in two days?!!
Would a TA of 120-130 pull the pH up that quickly? Or a possibly high salt content? (bi product of 8months liquid chlorine) ? Or--did the low pH leach the calcium out of the plaster?
Also, any advice for my 5 months pool service madness? They use trichlor tabs. Which, I think, is necessary for a once-per-week service. I'd like to keep the CYA from going too high again. I figure their monthly backwashing should help. I'll take over again in Oct. I keep the pH ~7.4-7.6 when I'm in charge, but it it is going to ratchet up like that, the Ptech will have to bring it low at the start of the week. Or is it better to let it ride on the high end?
As of this moment:
FC=6 CYA=60 TA=~110-120 pH=7.2 Calcium=700 (up from a steady 6months of ~530)
Thanks so much!