Hi, Summer,
You'll need to read a lot more. Poolsolutions.com and http://www.deh.enr.state.nc.us/ehs/chem.htm#ta will fill in the blanks for you on what you need to know. ( You've gotten a little confused on the Cl thing, I'll bet you've got CC in that pool)
How deep is the pool? Does the 35' length include the 15'x15' box? Be very detailed so you can get the correct volume...we'll all help if you get us the info. 12,000 gallons seems too small.
1. Get the muriatic acid in there (we'll tell you how much after we figure you're gallonage) and get your pH down to about 7.2-7.6
2. You must identify the stain. It sure sounds like iron and the ascorbic acid seems to have had an effect. Perhaps Marie or Ben will see this post and have some info for you. I cannot tell you how to positively identify the stain, nor can I tell you the best way to treat it...again, I think it's iron.
3. You're gonna' have to shock the pool but I'm not sure you can or want to do that 'til you get the metal under control. My reccomendation is a PM to "mbar" (that's Marie). She fights metal in her pool almost every year and seems to know more about it than almost anyone on the forum.
4. If it weren't for the apparent metal in your water, this would be an easy fix. But, you've got it and you're gonna' need some pretty expert help to get it under control. (I can answer one question, "metal out" removes NO metal, it only suspends it in solution...in other words, it's still in there...you just can't see it)
5. The pool store folks seem to be floundering. Their advice doesn't make much sense. "Trying" this and that will only exacerbate your problem. I would not put one more chemical in the water until you felt confident you were getting knowledgeable help.
This post will probably frustrate you because I sense you are hoping for a quick fix. With that staining issue, I don't think one exists. You're gonna' have to take it a step at a time.![]()
Dave S.
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