Thanks Gerri,

Just an update for you. I used a nylon stocking tied to my pool brush to get rid of the vitamin C tablets I bought for the test. In about one hr & one bottle of Vitamin C($5.00 I think) I cleanned about 1/3 of my pool. Since the stains have not returned I think I am going to keep doing this. In the end if all goes well it will only cost me $20 or so & 3 hrs of slow brushing.

Thanks for the advice I will post again after I finish