I'm not a newbie at TFP (supporter, TF100, etc). I slammed properly at opening in March. Took out lights and all. I never went to mustard algae shock level but I think that is my problem now. Pool had been crystal clear until last Friday.
Does mustard algae consume your chlorine at a higher rate than others?
Saw algae last Friday evening. Because I have SWG I hadn't been testing water daily, but weekly. After initial slam, SWG was keeping FC at around 7 when I tested on weekends. It is set to run 11am-6pm at 40%. Weather finally got (really) warm and last Friday I saw algae. Tested chlorine within an hour of pump going off and FC was 3.5. Cya had been 45 and I added enough to bring it to 65 after initial spring slam.....that worked. Tested CYA two weeks after addition and got 65 two days in a row.
So my best guess is that I was still within min CL.
So now....been slamming since Sunday (after seeing the algae) Keeping CL in the 30 range. OCLT showed 0 change overnight (SWG off, only used bleach for that) last night.......so here is my question/conundrum. I knew I wouldn't be home today (gone from 7am-9:30pm....kids ) so I told hubby to turn on SWG. I told him to set it at 60%. We were still above shock level this morning so I added no bleach this morning. Upon testing at about 10pm we were down to 22ppm FC after SWG running ALL day at 60%. The morning started at 30+ .
There is potential that it was testing error (on OCLT )...but I don't think so. Hubby is now assigned to be my back up counter of drops.
We passed slam in March. I didn't "think" my CL had ever dropped below min. I'm going to proceed with slam and then elevate to mustard this time but was wondering:
If mustard might be responsible for the unexpected loss during the day?
Should I really take lights out again? (The cavities were all clean last time in April/march)?
And I might be looking at a cell failure?.....although it was maintaining prior to last weekend.