Alkalinity with a vinyl liner

[denanbob]

My pool is fixin' to be one big cloud then. LOL!! My alk is 280 and my hardness is 450! UGH! I have some work to do...............

[CarlD]

I would agree. But the process is fairly simple:
Lower pH with acid to 7.0-7.2 to yank down alk, aerate to raise pH without raising alk. Repeat until alk is OK. This is the "short" version of Ben's stickied process. But it's the same thing.

When I need to do it, I have a sprayer that screws into the return instead of the eyeball. It's a fountain and it cost me all of $20--and it works very well. So does a crowd of boys splashing, or even leaving the pool uncovered with the return jet pointing near the surface.