I have an in ground salt water pool that had lots of staining from what I was told was metal in our water. The pool is only 5 years old but looked awful, I was heartbroken and thought I would need to drain it and acid wash. This stuff is amazing! I shut the filter off and used 2 pounds even though my pool is about 10k gallons. Left the filter off for about 3 hours then ran it for 6 and it was off overnight. I cannot tell you how surprised I was to see the bottom and half way up the wall looking brand new! The grill and return nozzles were super white, looking brand new, which was a bonus. The 2nd day was even better. I added a bottle of Clorox metal remover and let the filter run over night and my pool looks sparkling clean!!! I cannot express my joy at getting those stains out! I took pics at night before and the 2nd day after treatment. Very happy with the results and I’ll be treating my pool at opening every year.

We have noticed a discoloring with our liner over the past two years. We went as far as getting a quote last year to replace, thinking it was time due to the discoloration. This year, upon opening the pool, the discoloration was far greater due to metals and algae. I was looking for a liner safe scrubber with the plan to spend time trying to scrub the stains... then I saw this product. I am generally a very skeptical person when it comes to the claims made for the product, but the reviews were enough to get me to try it... after all, the product is far less expensive than a new liner! When I received the product, my skepticism increased when I read the label in that the product is made of food grade ascorbic acid - which is powdered vitamin C! What the heck is vitamin C going to do for my pool liner? I almost sent it back thinking this is a scam, but decided to try it anyway. Wow! Within two hours the metallic stains were mostly gone from the shallow end, and four hours later most of the algae stains had visibly reduced. When I woke up the next morning, the entire liner was clear of all stains and the water remained crystal clear! I am usually "underwhelmed" with skepticism, but this product overwhelmed my expectations!

I recently bought a house and the pool was yellow. I tried scrubbing and applied other products, nothing worked until I found this one and it was incredible. In 3 days after applying it, the pool was like new and the best part was that it didn't need scrubbing.

I wasn't expecting much from this but I did what it said to do and after a couple of days my white fiberglass pool that had tons of orange brown stains was now completely white again. A tip is to turn your pump off and put this in and leave it off for 24 hours. Just go ahead and do it. If you turn your pump back on in an hour or 6 hours or 8 hours or whatever this stuff immediately starts getting sucked into your filtration and pulled out of the pool where it's not going to do its job. If you put a whole bottle of this in your pool half of it's going to be stuck in the filter not doing anything so it's best to just leave the pool off for an entire day and the results are much better much faster. Turning the pump back on too soon renders this product useless since it gets filtered out too quickly.But I didn't look into it enough to realize that after you do this you absolutely must use a sequestering agent such as metal free or whatever the name your local pool place calls it to now get this metal out of the pool once it's lifted. Some of these products tell you that on the label and some don't but you have to or there's no point in even bothering. If you don't do this the metal stays in the water and eventually sticks right back to the pool and stains again. You absolutely have to do this just like you absolutely every pool season must use clarifier and a phosphate remover weekly. It's that important to do this immediately once this stuff works after a couple of days before you start doing anything else including putting chlorine in.Get the metal out first with a metal free sequestering agent before doing anything else or you going to be pulling your hair out a week later when the pool looks worse than it did before. Also, it's not as simple as the directions say to wait a day or two then rebalance. By a day or two later whether you started this with your pH low and your chlorine low doesn't really matter. The absorbic acid in this along with your chlorine will eat each other so all your chlorine is going to come out anyway regardless. Your alkaline and pH will probably go lower as well. That's why it's best to use this when you havent put anything in your pool for a couple of weeks where it's just naturally low on all the chemicals you need so that way it just does what it's supposed to do without you having to do anything special to get your chemicals out of the pool that we're already there. Just let them come down naturally in a couple of weeks then use this stuff.Once you use this all the chlorine will come out of the pool within a couple of days and naturally this will make most people want to start dumping chlorine right back in the pool immediately because everyone is afraid of the water clouding up or algae blooming again. But it's not a good idea because the absorbic acid has to be used up first which it in fact does stay in the water quite a bit longer than the couple of days it takes to whiten your pool or it along with the chlorine you put back in will eat each other immediately causing your pool to hold no chlorine. Then you'll be putting chlorine in every single day only for it to disappear in less than 24 hours. You just absolutely must use this, then a metal free agent, then once a few days goes by slowly start putting chlorine back in. This is a process that most people are going to find to be an extreme headache but it's the only way you can do it properly without having your pool becoming so imbalanced that you spend weeks trying to get it back to what it looked like before you put this stuff in to begin with. This will end up throwing your alkaline and pH off along with by the time you do all this with this product and a sequestering agent to get the metal out will create extra phosphates that will cloud the water. It's seems to be a lengthy process but worth it if you do it right and just deal with having your pool imbalanced for a couple of weeks. Mainly because you have to slowly put chlorine back in because if you put it in too fast it oxidizes the metals that are still in the water and restains. Trust me, if you don't do this properly the stains will come right back in your pool & will look worse than it did before since now it will be a cloudy mess and you will be spending tons of money and time going to a pool store having your water checked several times trying to figure out why it's not holding chlorine and why your pH and alkaline keep going too high than too low all the while having a cloudy pool but gleaming white as long as you didn't throw in too much chlorine too fast. If you do that it reverts to the old look and you're going to have to do all this all over again spending another couple of weeks trying to get everything clear and balanced.My suggestion is unless you can't live without ugly your pool looks early on in the season to instead do this closer to the end of the season when the summer is coming to a close and the luster of the pool has worn off where you don't really care anymore. Everybody knows that feeling that by then you're over it and you're just ready to be done with it. I personally used this right after I opened it and it cleared up because it was too unsightly to let go through the whole pool season. But if I ever did it again I would definitely wait until around September because the amount of time you're going to have to put into getting everything back to normal and clearing the water up and keeping the pool holding chlorine and getting the absorbic acid and metal out of the water almost isn't worth it if you're trying to get your pool cleared up for the holidays during summer. It can be an extreme headache but worth it in the end. You just have to know this going in and none of these products tell you that this is what's going to happen. Just be ready to make several trips to the pool store to have your water samples checked and you're probably going to go through by the time you do this more chlorine getting everything back to normal along with muriatic acid and PH up and alkaline up and taking those back down. It's an extreme headache but again can be worth it if you're patient and know this going in. It's not as simple as putting this in and it turning white and you just dumping chlorine back in and everything's fine. It's too bad it's not that simple but it's just not the case. You have to be careful when doing this or you're going to have a very long summer pulling your hair out trying to get your pool balanced back after using this.

Our liner is 12 years old vinyl liner so we just thought was going to be permanently stained after all these years. This year was worst it has looked after getting water perfect salt/chemical. The water was clear and perfect but looked green because of liner stains. You could see bottom in deep end clear as can be. I researched and found this product and was skeptical. SO GLAD I bought and tried it. I sprinkled on stairs and in thirty minutes they were white. I did just the shallow end hoping it would look better. In 7 hours i was amazed the entire shallow end stains were gone except a little part. So I orded more to do the deep end. But next day went out and the deep end stains are almost gone now as well. Pool has not looked this good in five years.UPDATE: The water is now cloudy, took water sample to the pool store and they said the metal is now in the water from the liner, so bought $80 worth of metal out to try and get metal out of the water now (makes sense that the stains were removed from 5 or more years on the walls and now in the water, I guess). Will update again to let everyone know if this works. At least walls are still blue and water is blue...UPDATE2: Water is clear again and still blue. Definitely recommend this product, just know you will have to deal with metal released from stains in the water. I am also going to put some packets of C U Later in our skimmers to help maintain the water.