I'm helping a friend get his pool balanced and teaching him how to properly maintain it. He recently installed a SWG and now has yellow stuff covering most of the floor of the pool. I ran a full test on it last night and got him started shocking. Most of the "stuff" on the bottom comes up when brushed, or vac'd, but there is still quite a bit that we can't seem to scrub off.
36,000gal plaster pool shaded most of the day
2hp pump (new A.O. Smith motor this season)
New SWG (50,000 gallon model, can't remember the brand off hand)
TA 210!!!! (got him started adding acid to start bringing that down)
CH 310 (been using Cal-Hypo before SWG)
CYA 0!!! (Tried to get some from Walmart when we were getting bleach but they were out. Trying to get some today to get him
We dosed to a shock level of 13 (based on the calculator) and gave it an hour. After an hour we tested again and got FC 13 and CC .5. Dosed up to 20 (I think he miss calculated, I had left by then) for the night and was at 16 this morning, but still CC at .5. Although it may have been a larger drop, can't remember if I told him to turn off the SWG (which is in boost mode) for the OCLT.
I'm starting to wonder if it actually is algae....... I figured the CCs would jump quite a bit overnight. The water is only cloudy after we brush the "stuff" off the bottom. I'm going over at lunch to check it and dose if necessary and will take a picture and post it along with the test results.
Thanks for you help in advance. I would have been lost with my pool if it weren't for you guys!!!!