Natural Chemistry 07395 Extra Strength Stain Free, 1-3/4-Pound

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.

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!

This gets out well water stains like no bodys business!! Highly recommend for filling pool or just topping off. This has been our go to since 2018!

I owned a pool service company for 4 years. This stuff always saved me with my customers, and keeps my pool crystal clear, here in NC the water (city) has a good bit of iron in it that stains all pools. This stuff (ascorbic acid) makes the iron release. Combine this with a C-Ulator pack and it will get the stains out until the next time you have to “top up” your pool with the hose.

This product works like magic when applied to pool surface stains. The down size is the stain comes back after a while. Also, the bottle comes half empty. I wish the bottle was fuller so there was more product to use.

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!

West wanted to take pictures because with Anna about minutes of us putting it into the pool. The stains on the side started disappearing and the pool was beautiful.

It actually worked really well for me. I have a in-ground concrete/plaster finish pool that is now more than 10 years old. Recently got some staining near to the deep end. I have no idea whether it was metal staining, salt staining, or organic staining. The instructions on the bottle are very detailed, and include purchasing two other products. I followed the directions (very low PH and chlorine levels, etc) except for puchasing the other products. Almost immediately the stains faded, and the pool looks pretty close to new.