I'm starting a new thread as my old, long one seems to have gotten lost in the shuffle.
I'm pretty sure I have mustard algae, thanks to info from you guys. My most recent test results were on 6/5 as follows:
FC =17, CC = 0, pH = 7.6, TA = 90, salt = 3400. A problem is the CYA. I thought that CYA = 65 on 5/30 but tested again on 6/4 and got 50. Test results per K-2006. About the FC = 17, I was in the process of shocking so I could do mustard algae shock.
On 6/5, I added muriatic acid (per Pool Calculator specs) to lower pH to 7.2.
On 6/6 in the AM, overnight FC loss was < 1 ppm and CC = 0 so I started mustard algae shock treatment. FC that morning was 27.5 and I added 21 qts of bleach to add 14 ppm so I would be at 48.5 ppm (over mustard algae shock level) AND turned on SWG as I had to be gone all day. At 7 pm, I turned SWG off and tested FC = 31. I added bleach = 8 ppm.
On 6/7 early am test results were FC = 37. I added bleach = 12 ppm and turned SWG on again as I was gone most of the day again. At 12:30 pm, FC = 35.5 and I added bleach = 2 ppm. At 7:15 pm, FC = 29.5. I turned SWG off and added bleach = 16 ppm.
I have brushed walls, sides, ladder, etc, ever time I've added bleach.
I have not been able to keep FC at or above mustard algae shock level for 24 consecutive hours so far. Tomorrow (Fri, 6/8) I can be at home all day if needed. Please advise.
thanks.
Am I way off track on this?