orange/brown stain treatment, how long does it take

[leejp]

Say it ain't so... not another one!

Getting the stain off was easy... But I never managed to Keep it off. I've had good luck in getting the stain off the liner with:

Plain old Vitamin C (Ascorbic Acid - bulk, 3# cost something like ~$30)
Sparkle Conquest (~$20/quart)
United Chemical Pool Stain Treat (~$20/2#t)

Each of these products were very effective at removing the iron stain off of my Vynil liner. Drop the PH and FC an Bam! Stains lifted off the liner in ~12HRs and the pool never looked so good.

In each case I've put in a metal sequestering agent (Metal Free) so I could filter it out... No luck. Once the FC levels were brought back up, perhaps too quickly so the stains returned.

I've just had my fill water (city water) tested. Perfect, no iron! I have no metal components/parts in any part of my plumbing/pump/filter system so it had to have come from the fill water (pool came with the house, I did not install/fill the pool). If I can manage to get the iron out I think the liner will stay clean.

I have a plan this year! I will (modified from :

day 1. start pump/filter, run continuously, test every day, adjust Alkalinity, add polyquat.
day 2. add Pool Stain Treat (list iron off liner and suspend in water)
day 3. hit with a big dose of metal free (sequester iron)
day 4. slowly start to chlorinate with skimmer sticks (stain the filter/DE vs the liner)
day 5. backwash, more metal free, keep slowly chlorinating with skimmer sticks
day 6~10. Adjust CYA, Adjust pH
day xx. When FC reaches optimal level, backwash and switch to bleach.