SWG Operation - Lessons Learned

[waterbear]

I have a fiberglass pool, my fill water has a pH of 7.2 and an TA of 110. My pool also has TA of 110. I have to add acid every 3 weeks to get my pH to 7.2. After 3 weeks it goes up to 7.6 or slightly higher and I add acid again. Run my cell at 5% output with 8 hours of run time to maintain 3ppm FC. Still a small price to pay for the sparkling water I always have with the SWG! I would think that the non reactive surface of fiberglass would be similar to vinyl but my pH does rise. Granted I have to add very little acid when I do. 1 gallon lasts close to 6 months!