Quote Originally Posted by mbar
You will probably have to do a stain treatment. You are using a product that is probably a sequestering agent - it will bind with the metals that are suspended in the water, but if the stains are embedded, they will not lift off with just the sequesterant. You can get ascorbic acid which is vitamin C, or there are other products that use oxcylic acid? I am not sure if that is the right spelling. I always use the ascorbic as it is the most mild. Here is a link to buying it cheaper than the regular pool products.

http://www.msm-msm.com/store/agora.c...scorbic%20Acid

http://www.chemistrystore.com/Ascorbic_Acid.htm

If you chose to do this treatment, I can give you directions on how to use it.

Marie:

I have a similar problem. I have an AG Doughboy 12' X 20' pool, 8,200 gallons. I live 15 miles West of New Orleans. I have been fighting staining problems since Hurricane Katrina. My readings are:

FC - 3.0
TC - 3.0
PH - 7.5
CH - 160
Alk - 130
CYA - 50

I have brown stains that are on the bottom of the liner. I have tried a product called Pool Stain Treat by United Chemicals. The active ingredient is Oxalic Acid. I was told to add one quart of EZ-CHLOR, Metal Magnet. I was told to shut down the pump long enough to have the water completely idle. Mix 1 pound Pool Stain Treat to 4 gallons water, mix well. Then, get a 16 ounce cup and gently pour the mixture into the pool over where the stains are. The mixture is heavier than the pool water, and you can see it going to the bottom. When it hits the stain, most of the stain is removed and the water gets cloudy. You continue this process until all the mixture is gone. By the time you finish, the pool is cloudy and you will have to start the pump and shock pool. I used 2 lbs of the Pool Stain Treat and it worked well. I still have some stains and I am waiting for the ascorbic acid I ordered. I am told that you are suppose to use the same process with the ascorbic acid. I hope thjis helps. If you have any other ideas to help me reomove the rest of my stains, give another post. I am ordering the new kit, PS234 and hoping to run all my own samples.