My new plaster pool is COVERED in green stain..

[PoolDoc]

Dark green (greenish blue can be copper) is not a color I've seen, so I can only offer general advice.

1. Try to get your chlorine down -- if it's the pool tech's fault, ask him to lower it. High chlorine generally increases metal staining.
2. Don't bother with liquid metal control agents till the chlorine is down -- chlorine destroys them.
3. Ascorbic acid (vitamin C) is ALSO destroyed by chlorine.
4. Lower your pH as low as your plaster guy allows -- metal staining decreases as pH decreases.
5. Have your water tested for copper.
6. Find some other place to test, if you can -- a pool store that can't test for high chlorine probably can't test anything reliably.

You probably want to lower chlorine and pH ASAP. Stains tend to become harder to remove the longer they are in place. So, it may be pretty urgent to get chlorine and pH down NOW. A responsible pool tech should be willing to make extra trips to resolve a problem he helped create, even if it was an accident on his part.

Also, use polyquat as soon as you get your chlorine low. (High chlorine ALSO destroys polyquat!) And, then, keep your chlorine low, replacing chlorine with polyquat. I'd avoid non-family use for now.

Ben
"PoolDoc"

[hausfrau]

THANK YOU. I will do this and see what happens.

[Watermom]

Do you know what the name of those other tabs were? Did you read the ingredient label? Some trichlor pucks have copper in them. You NEVER want to buy those. I *think* they may be called dual acting or something like that.