Best Swimming Pool Stain Removers of 2025

"I recently purchased a house with a yellow pool. After trying various products and scrubbing, nothing worked until I found this one. In just three days, my pool looked brand new without any scrubbing!"

"I had stains on my sun deck area that persisted all summer despite double shocking. After trying multiple vitamin C options with no effect, I decided to try this product. I ensured the pH was correct, sprinkled it over the stains, and let it sit. Five hours later, the stains were completely gone! I was truly surprised and will definitely purchase again!"

"Initially skeptical about this product since I had been using other cleaners for my pool steps, I switched to a saltwater system, which caused yellowing. I tried this product and saw a noticeable change in minutes. By the next day, my steps looked even better. It’s magical and worth the money! I only gave four stars because I noticed a bit of yellowing again after two days, but I plan to try it again."

"I have a saltwater fiberglass pool in southwest Florida. I notice rust-colored stains occasionally, and I splash some of this product on whenever I see them. It has become a key part of my routine, especially when filling from my well. I've tried various methods for removing stains, but this is the most effective for me."

"I recently tackled stubborn scale buildup in my pool using Clorox Pool & Spa Swimming Pool Scale, and I was truly impressed. It removed scale deposits from the tiles and waterline quickly without excessive scrubbing, saving me time and effort. Plus, it's gentle on my pool surfaces, which is essential for longevity. The application was straightforward, and considering its effectiveness, I found it to be reasonably priced. Clorox is a trusted brand, and this product certainly lives up to that reputation."

"I often deal with green metal deposits in my filter, and this product has been helpful. I wish it were a bit more affordable, but it definitely assists in keeping my pool cleaner."

"After a backwash, my pool had red stains from iron in the water. I chose this product because it was much cheaper than the store's brand. After just one day, all the stains were gone! Just follow the directions carefully, and it’s a miracle worker."

"My 30-year-old pool was in terrible shape with metal stains and I was considering resurfacing it. A friend gave me this product, and it worked wonders in just one day! My fiberglass pool looks sparkly clean and brand new now!"

"I had some fertilizer stains on my plaster pool that brushing couldn’t remove. I almost returned this product after reading the label about lowering chlorine, but I followed the instructions for surface stains. After just four hours, every single stain vanished without any extra work from me!"

"I was very hesitant to use this in our pool, but it worked well alongside other iron removal methods. Our hard well water made the pool look dirty, but after adding the metal out and using the sock method, our pool was clear in a week. I only needed one bottle since we don’t have new water running through constantly. The sock method was crucial for getting all the iron out."

"I rarely write reviews, but as a pool owner facing multiple issues, I felt it was necessary. I dealt with staining from organic debris, rust stains, and caked calcium at the bottom. I used two bottles for my 17,500-gallon pool and saw all stains disappear after two days. Patience is key; it took three days for visible results. I plan to repeat this treatment each year to keep my pool sparkling!"

"This treatment didn’t help with the light brown stains on my pool liner this year. It might not have been suitable for my specific issue. I didn’t see any improvement at all, which was disappointing."

"I had terrible copper staining on my pool liner. After using this product, it worked like a dream! My liner looks brand new within just 8 hours. Just remember to turn off the pump and do a light scrub. Great value for the money!"

"I had reddish discoloration on my pool steps from iron in the water. I was hesitant to try this product, but it worked like a charm! I poured it directly on the steps, brushed a bit, and let it sit overnight. In the morning, the steps were bright white again!"

"After opening my pool, I found horrible stains over the entire liner. I was so embarrassed and thought I might need a new liner. I sprinkled this product around the pool and brushed it. 18 hours later, the stains were completely gone! I couldn't believe my eyes—this is a miracle product!"

"I recently tried ScaleTec on my fiberglass pool, and I can't stress enough how amazing this product is! It effectively removed the scale and left my pool looking crystal clear and sparkling. The application was simple—just add it to the water, and it worked its magic. I'm thrilled with the results and recommend it wholeheartedly!"

"We had some calcium buildup on our pool tile and were advised by our cleaning company to try this product before seeking professional help. We poured in half a bottle and adjusted the pump to stir the pool longer. After two weeks, I noticed a significant reduction in scale, and after using the second half of the bottle, our pool was scale-free! I'm so glad we gave it a shot!"

"ScaleTec Plus has been a game-changer for my concrete pool with Diamond-Brite plaster. I followed a specific treatment plan and used ScaleTec alongside other products. In just 2-3 weeks, 80% of the scale is gone! This product is now part of my regular maintenance, especially in areas with hard water like mine."

"I've used this product to remove iron stains from my pool, and I've never been disappointed."

"Initially, I was skeptical, but after reading numerous reviews, I decided to try it. I had weird stains on my sand-colored fiberglass pool. Despite multiple attempts with different products, I was desperate. After using this, I got my chlorine level down and added the entire container. After 48 hours, the stain on the bottom was gone!"

"I sprinkled it around the pool and was unsure if it would work. However, after a few hours, I returned to find a totally clear pool. I regret not taking a before photo, but I highly recommend it for metallic stains."

"I experienced a ridiculous amount of rain this winter, and when my pool was opened, the brown scale stains on my vinyl liner were everywhere. I felt defeated, thinking I'd need a liner replacement. After researching, I found this product and decided to give it a try. I was amazed when the next morning revealed that every single surface except the sides was completely clean! I couldn't believe it!"

"I have a 40x20 inground pool, and towards the end of last year, I noticed reddish/brown stains on various parts. After trying the vitamin C test, I discovered the stains were metal-related. I ordered two containers of the Stain Free and, after following the instructions, was shocked to find that everything looked brand new the next day. The results exceeded my expectations!"

"After dealing with orange rust-looking stains on my white pool stairs, I decided to try this product instead of the costly Leslie's brand. I added half the bottle while the pump was running, and by the next day, I noticed lighter stains. After a few applications and using the Metal Free liquid, my stairs are now bright white and my water is crystal clear. I’ll continue using this product regularly!"

"I use it monthly in small doses to keep my pool clean. It works well, and I don't need much chlorine. It also helps prevent stains from leaves and other debris."

"Initially, I thought the stains would be gone overnight, but I waited it out. By day 4, they were completely gone. I used one full bottle on my 18 by 52-inch Intex pool. I almost bought a second bottle but was cautious about the product's effectiveness."

"I had multiple stains, both metal and non-metal, in my pool. I applied this product as instructed, but unfortunately, not a single stain was removed. I would suggest looking for a different option."

"I was shocked at how magic this stuff is at removing iron stains from my pool! It worked like a charm!"

"As a homeowner, I struggled with iron stains until I found BioGuard Erase Iron Stain Remover. I sprinkled it in, and it worked immediately! My pool looks fantastic now!"

"I've had iron stains in my granite pool for years. After using this product, the bottom looks brand new! However, it doesn't quite reach the walls as well."