I've got brown stains at the water line on my fiberglass pool. Municipal water supply. Long story short I got tired of the stains as they seem to get worse over the two years I've owned the pool. Did some research. Tried a tri-chlor tab and had no effect. Tried a magic erase sponge and had no effect. Picked up a bottle of vitamin C and it was like magic. One tablet cleaned a good 3 or 4 feet of the stains away. So, I know its iron stains and need to do the AA method of stain removal. I can't do it this week as my kids are taking swimming lessons in the evenings up until and including Monday of next week. On Saturday, July 4th we are having a pool party. I'm not sure I could do the treatment in time to get the water balanced, clear and ready to party.
So after all that blabbling, here's my questions:
1)Since the stains are only at the water line, should I just put some vitamin C in a sock and clean it off?
2) Any idea how long it would stay clean?
3)Should I then put some metal sequestrant in the water?
After the party I'll do the real ascorbic acid method and determine a more permanent course of action. Thanks for any advice!