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

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.

I was skeptical of this, but it actually saved me a good $1000 from having a drain and acid wash done. I honestly didn’t know how to test ph or chlorine and just took a chance by pouring it in. Got rid of dark stains on white plaster that can happen when the chemistry is off from time to time. Returned to a white color. Couldn’t be happier.

Works as advertised. Gets the cloudy/haze and stain color out. Highly recommended.

Great product, fast delivery. Removed brown metals from white pool fixtures

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.

This works great on my pool & I love how fast the ascorbic acid (Vitamin C) takes out the stains, but it is irritating that when I open the bottle that it is not a full bottle. This is expensive & I have to buy it often, so when I only get 2/3rds of a bottle, it irritates me. It is too expensive to not get a full bottle. (fyi: You could purchase Vitamin C tablets, and they might work just a well yet be less expensive).

Was worried about what people said of cloudy water after using this. That did not happen. My liner looked awful. It was patchy yellow brown on at least half of the floor. Thought maybe it was yellow mustard. Bought chemicals for this. Did more searching came upon staining from minerals. Decided to do this first. Am I glad. Followed other review sprinkling it in and then recirculating for about two hours. Shut off pump over night. The next morning it was back to being blue. I was never so happy! Turned on the filter and brushed the bottom. Then poured in Metal Out according to the bottle and let the filter run the day and night. Everything tested fine except the chlorine of course. Did add some algecide. Several hours later some chlorine. I am adding it in gradually. Not going to shock for at least a week just to be safe. Three days in and the pool is super blue and crystal clear. Running the pump on my regular schedule and off at night. I never had this issue in the thirty years we had the pool. Could not say enough how great this product is. Don’t be scared to try it.

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!