Natural Chemistry Extra Strength Stain Free, 1.75 lb, Single Pack

WOW WOW WOW My pool was very rusty and brown when we opened it this year. The liner is several years old, but I thought I would try this and it worked!! My pool looks clean again. Very satisfied! I followed the directions on the bottle.

This is a great product. Just make sure you have your water chemistry according to the directions

Ascorbic acid, it works well! While this is a bit more than I'd prefer to pay for Ascorbic Acid, it is specifically labelled for pool use and unlike any of the Citric Acid products, does a better job without the nasty after affects those cheaper solutions use. Be aware that you'll need to bring your Chlorine down to zero and pH down to 7.2 or so before applying the dry acid. In the case of my pool, I actually needed a full second so be sure to get two if you think you need one. Apply some to the sides with a small cup (wish it came with one of these!) and in seconds to minutes, you'll see results. Make sure to have Algaecide without copper ready to be used, if needed. Otherwise, the other item you'll still need is their Metal Free product to suspend the metals until they can be trapped in your filters. Afterwards, you'll need to keep adding this, replace your filters which may help some and ultimately replace your water but for now, this makes a stained pool looking great in no time!

This worked great to remove rust stains! I tried physically scrubbing the stain with zero change. In the first I tire, you can see two rust stains. There’s another one to the side. So I put this product in a tube sock. Added a rock. Tied off the sock. Dropped it on top of the first stain, rock side up, shown in the picture. 5 minutes later it was almost all gone. Repeated for all three spots for 10-30 minutes and they’re all completely gone!! I didn’t have to use so much product and we can get the pool opened sooner than treating the 27k gallon pool. I did sprinkle one can around the edges and the sides are all clearing from slight discoloration. The pool looks perfect! I’m super pleased! Highly recommend!

I used this product on my pebble rock finish in my in ground pool. Followed the instructions and I was pleased with the results. I will definitely keep this one on the shelf for future use.

It works. My pool liner had brown-green stains due to high level of minerals, specifically copper. I decided to try this product after watching some YouTubers using it and all im going to say is, it works.

Great price!

Our pool is several years old, and the staining from the Arizona hard water has been taking its toll. It was not horrible, but I was thinking about getting the pool replastered. I did two passes with this product and followed the instructions to a T. Looks almost like a brand new pool - very blue and inviting. Super happy with the results. I'm buying another bottle for maintenance - probably twice a year.

used for removing metal staining on the whole of a pre-formed pool. excellent.