Recently, I installed an IC60 SWCG along with an Easytouch 8 for our in ground white plaster pool. The system has done a very good job of generating chlorine, but I just can't seem to keep the pH in range. It seems to go up very quickly, to the point where I'm having to add over 2ga of 14.5% HCl every week and still not achieving appropriate pH. I think I'm also starting to see evidence of greyish discoloration and scaling in the pool. These are the numbers I got tonight using the TF100 kit:
FC 6.5 (FAS/DPD)
pH 8.2 (from what I can tell)
SALT 3200 ppm
I know that both my TA and CH are too high, but I really don't want to do a water change unless completely necessary. The water was changed out about 3 years ago when we bought the house and had an acid wash then.
From what I've read, Borates might help to buffer the pH. I'd really like to keep the pH in the range of 7.4 to 7.8. Do I really need to drain a bunch of water and start again with lower CH and TA levels to help reduce scaling and pH buffering? Should I dial back the amount of chlorination via the IC60? I've been running it at 40% for about 8hrs/day and the chlorine range seems high, but okay for the CYA level. Before the SWCG, I rarely had to add acid to keep the pH range around 7.5 or so, but ever since, it has been a problem as described.