I have rust stains around my 2 skimmers and the light on my vinyl inground. Vit C removed the stains last year in a test - never did the whole process. Would like to do so this year before I close, but I have 2 issues:

First, I think that the rust is coming from the wall panels. The liner was replaced 2 years ago - the original structure is from 1981. If it is the walls as I suspect, this will be an ongoing issue. I am concerned that the walls may be in danger.

Second, in the metal removal sticky by Marie, her instructions say to leave the fileter on circulate after putting in the ascorbic acid. That's not an option with my Hayward Perflex DE filter - what is the workaround for this?

Thanks all -