We've had our pool about 6 years and have suffered through a few algae outbreaks over winter when we forgot all about the pool. Last year opened to crystal water and I want to do that again!
Discovered that the pucks had run out around turkey day when we were heading out for a 2 week vaca. Refilled the chlorinator and cranked it up to max, plus added 4 gallons of bleach (chlorox outdoor - I presume 6%). Figured it couldn't hurt anything. Also vacuumed out crud, brushed and backwashed before we left, and made sure permeable cover was well secured.
Got the TF-100 around Christmas, so was only making guesses about chlorine at the time.
The water is slightly greenish now, with plenty of productive backwash (done every two weeks). Can easily see the bottom, where there are less little dust piles than before but still some. I ordered some biodiesel filter bags to make my own slime bag for the eyeball return.
I turned the chlorinator down to 1 two weeks ago. Here are yesterdays numbers. Only big change in the last two weeks is FC went from 15 to 20, so I nudged it down to .5 yesterday. Newly this time the water is slightly prone to foaming or bubbles when agitated.
FC 20, CC 0, TC 20, pH 7.5, TA 120, CYA 40, temp 46 deg F, Borate 15
Pressure is up to 35, which is new. We changed the sand late last summer and put in ground glass medium, and I think a bag of DE? It isn't a DE filter though.
I just read the instruction for getting the sample to room temp for the CYA test so that may be wrong. We get a lot of rain so there is quite a bit or water turnover (whether we like it or not) that keeps CYA low even though we use pucks. Not a lot of sun, though, except in August.
Should I just keep the chlorine cranked until the green is gone?