I am posting my pool readings for the last 11 days. As you can see pH is all over the place. I pulled the SWG and it was pretty clean but I followed the mfg. instructions and acid cleaned it anyway.The water is very clear and I don't see any dust when I brush. Come to think of it, last year when I brushed I would always see dust. That must have been when my plaster was being attacked! Also, last year is when my original Jandy SWG needed replacing. During that time my pool chemistry got out of whack as the SWG quit right before our vacation and I neglected the pool for about a week. It's all starting to make sense now. I feel like I have things under control now but it is driving me nuts chasing the pH like that. Any suggestions on the pH? Am I resigned just adding acid every other day?

As for the chlorine, I read elsewhere on your site that 4.5% of CYA is good for a SWCG pool and you are saying 10%. Why the difference?

One more thing Doc. What are your thoughts on a "No drain acid wash"? My plaster is blotchy now and I was wondering if that would help with the blotchiness and maybe smooth the plaster at the same time.

Here are my pool readings:


Date FC/ CC/ pH/ TA/ CH/ CYA

7/13 1.0./ 0.0/ 7.8/ 110/ 320/ 90/ Added 3 pts. MA

7/14 2.5/ 0.0/ 7.4/ 70/ 300/ 80/

7/15 2.5/ 0.0/ 7.6/ 100/ 300/ 80/ Added 1 pt. MA

7/16 3.5/ 0.0/ 7.8/ 100/ 300/ 80/ Added 1 pt. MA

7/17 4.6/ 0.0/ 7.8/ 80/ 300/ 75/ Rain, no acid

7/18 5.4/ 0.0/ 8.0/ 100/ 300/ -- Added 1 pt. MA

7/19 5.0/ 0.0/ 8.0/ 75/ 300/ -- Added 2 pts.MA

7/20 6.8/ 0.0/ 7.6/ 75/ 300/ --

7/22 6.5/ 0.0/ 8.0/ 100/ 275/ 80/ Added 1 pt. MA

7/23 5.8/ 0.0/ 7.8/ 75/ 275/ --

7/24 6.4/ 0.2/ 7.8/ 75/ 275/ -- Added 1 pt. MA