http://www.msm-msm.com/store/agora.c...scorbic%20Acid
I have a 35,000 gal fiberglass pool and it stains all the time. Dont have a heater, and no iron pipes. It takes about a pound to a pound and a half of ascorbic acid to make the pool beautiful again. This is the cheapest I've found for it. $45.00 for 5 lbs. and if you buy over $100.00 at a time its free shipping. Heres a pic of my fiberglass pool.
Good Luck


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