I live in southern ontario canada. I have is 23,000 gal vinyl lined bromine pool.
Once open and cleaned up, the pool is clear and I do not have any swim season algae issues.
But opening can be quite a challenge
I use a mesh winter cover and over the winter the pool can get quite dirty.
The pool water is fairly clean when I open, but the walls and base are always coated with a think layer is green when I open it.
I kill the algae with liquid chlorine (5 gal) and let it sit.
I'll typically have to use some sort of flocking agent or pool 1st aid to get the suspended particles/dead algae out.
This can take weeks to get clear water with a lot of vacuuming to waste. Time consuming and wastes a lot of water.
I typically close it early oct with a heavy liquid chlorine shock and added baking soda to get the PH up.
I have not been using any other closing chemicals.
Would appreciate suggests re how to prevent the algae build up over the winter.
Thanks in advance