OK, I lied. The algae problem isn't solved. So let me provide the details.
- Opened the pool in May, perfectly clean water, no problems
- Stayed OK until late June - minor algae, added 4 gal of Shock, adjusted the pH, had it under control in a day.
- Last week it came back again - it took 16 gallons of shock to kill it and 4 days of work - vacuumed it twice, both times to waste, the water has been crystal clear and free of any green stuff since Wednesday. Thursday added a quart of algaecide
- Today (3 days later) i'm starting to see traces of algae in the shady corners of the pool. It's the light floaty kind that settles to the bottom. It all appears loose, in the sence that it settles but it not stuck to the liner.
The Cl level is still high from all that shock. I haven't added any since Wednesday. Stats are as follows:
- pH = 7.8
- Free Cl = 25
- Total alkalinity = 40
- Stabilizer = 50
I realize the total alkalinity is a tad low, but last week every time I tried to adjust it up the pH went too high as well. The pool has only been used by 1 person for a couple hours since Wednesday.
I'll vacuum the edges to waste again in a day or so, and keep the Cl up. Any other words of wisdom?