Natural Chemistry Extra Strength Stain Free, 1.75 lb, Single, Removes Metal Stains from Pool Liners & Finishes, Compatible with All Sanitizing Systems

This is truly a great product. Works wonders on the worst stains in our pool. I absolutely love this stuff. Removes yellowing stains from the stairs as well as other areas of the pool. Works quickly and leaves the pool beautiful. I recommend this product for sure.

It worked on a stain I had in the pool for years and couldn’t get out. I got scared after I applied it because it turned black, but I left it to do its thing and two days later the black haze was gone and so was the stain!! I was impressed. I don’t impress easily.

AMAZING!! Saved me from a heart attack. I had put a POOL rx in my skimmer on a Sunday took a pool sample to the store on Tuesday and it showed no chlorine. I sprinkled a bag of shock in 2 places in my pool within 10 minutes a had 2 HUGE black spots on the bottom of my pool at least 6'x8'! I immediately put in mineral out it did nothing. I had some of the stain free left over from years ago I had my husband put on a mask and go under to right above the stain and sprinkle it on within 5 minutes the stain began to lift within 2 hours it was completely gone! I just purchased to have on hand in case this ever happens again do not want to be without this product!

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.

I had stains on side of in ground fiberglass pool the entire perimeter of the pool from neglect over the winter months. Stains were a brownish green and probably 2-3 feet in height . I scrubbed, used magic eraser...bleach. No luck. I seriously thought I would have to get pool resurfaced as nothing worked. This stuff is truly a miracle. Simply poured it in close to the sides and on steps and within 3-4 hours...most stains gone(I honestly could so the stains fading before my eyes as soon as I poured it on the walls of the pool directly). By next day completely clear and pool back to original blue. It did cloud pool a tiny bit but once I shocked the pool and ran the filter 24 hours.....it was clear as can be with zero stains. HIGHLY RECOMMEND. I would image it would do same job on fiberglass hot tubs and boats as well.

This stuff really works! Took the stain right out of the bottom of our pool

My in-ground pool was contaminated with fertilizer causing stains at the pool floor and walls. Given the severity of the case, I hired a pool company that drained the pool and performed an acid wash. The acid wash removed most but not all the stains. I still had ugly yellow splotches at the steps and bottom of the pool, coupled with streaks along the walls. I was told by my regular pool company, the one that did the acid wash and two others, that the issue was a failure of the resurfacing material (Florida Gem). This is equal to a several thousand of dollars repair and all the companies I consulted were eager to do the work. I didn't believe the advice as my pool was resurfaced only 4 years ago. After more than a month of seeing my unpleasantly looking pool, I started reading multiple web articles and watching YouTube videos. During my research I came across with this product and having not much to lose, I decided to give it a try. Here is the way I applied the product: 1. Balanced the chemicals of the pool, following the instructions in the packaging strictly and without shortcuts. 2. Turned off the pool motor. 3. Poured the container of Natural Chemistry Stain Free along the border of the pool and in the affected areas. 4. Turned the pool motor back on for two hours. 5. Turned off the pool motor overnight (10 hours). Based on the size of my pool, half a bottle of the product should have sufficed to do the work. I used 3/4 of the container. Within a few minutes, I could already see some of the stains lightening up. After one hour, the stains at the pool steps dissapeared. The next day - no stains, not even the streaks along the pool walls which I thought would have been impossible to remove. I am incredibly happy with the results achieved with Natural Chemistry Stain Free. If the stains come back, I will update this review. Fingers crossed, I won't have to.

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