Greenish stain near bathtub drain Q???

Thanks Oren. Yeah, all my pipes are copper. Dang!!! Always something. Maybe it would be cheaper to modify my softener system.

That tells me that you have acidic water. Not good.

I'd contact the business that refinished you tub, or any local company that does that kind of work, and see if they know of the problem, and what the fix is.

If anyone would know what caused the stain and how to get rid of it, they'd by most likely to know.

Haven't tried yet but plan to this weekend. Also, my WS is an exchange system because we're not supposed to backflush our tanks into septic. But sewers are being installed next spring so that may change.

I'll post my results when they happen. Happy week end all.

Copper stains are pretty easy to get rid of. That's not the point, though. If the stain is copper, it means that his pipe is being eaten away.

Water treatment?

Depending on what the underlying problem is, the solution might be as simple as a softener. It may take a little more but it's not an insoluble (sorry) problem.

It the problem is due to acid water, then consider treating it promptly. My sister has that problem with spring water which was handled for some years with a system that used ion exchange. Salt had to be added to a tank from time-to-time to reactivate the exchange media. She didn't service the salt tank for some weeks one year and was rewarded with several pin-hole leaks in her copper pipes and an expensive visit by a plumber.

Tomsic

I have a slow drip from a faucet in a bath that is hardly used. Because of this slow leak over time there is now a blue green stain under spout. Note ; I have city water, copper pipes, and a newish water softener. The tub is fiberglass. I have used typical cleaners, but to no effect. Researching the internet I read about a "Cream of Tartar" and "Baking Soda" mixed in equal parts with water. These items are available in the grocery sore. Great, o kay, yes I tried it, and "good golly miss Molly" - it works. First application did 80% to removed of the stain. I slathering on more pa ste for a second shot, and I waited 2 hours. More progress, but not comple te. Third try, more slathering, and in addition I left a damp cloth over t he application site over night so it would not dry out. Yes, more progress, 98% done. Remember I am not an expert - I'm just working the problem. Full disclosure; I am a former naval pilot who is working on a 25 year old house. I do not have any affiliation with McCormick Inc., and their "Cream of Tartar", or Arm & Hammer Inc., and their "Baking Soda". However, I happ y I'm pleased with the results. There are a lot of solution on the web. They don't always apply to your pa rticulars. I spent several hours on the net for this answer. Good luck.