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Hello Jason, I went with ascorbic acid a 5# bulk pkg for $57.50 + $7.5 shipping for a total of $65.00. I found that Natural Chemistry's 'Stain Free' (1.75lb/$30.00 x 3 units of Citric Acid) would have cost $90.00 (even with free shipping), and if, as you say, I would need twice as much...

Thank you for responding. I was thinking as you were about the effects on the liner. I have been doing a lot of research on-line regarding stain removal and follow-up sequestrant usage. I've decided to use the ascorbic acid treatment to try and lift the stains, followed with an initial dose...

Has anyone heard of using "Iron out", the rust stain remover normally indicated for water softener cleaning,on rust stains in the bottom of a vinyl in-ground, with a heater? The salesperson in the pool store said it works and is sooo much less expensive than ascorbic acid or Jack's products. MAlex