Natural Chemistry Extra Strength Stain Free, 1.75 lb, Single Pack

Following a refill after a repair, my white 11k gallon fiberglass pool turned solid brown in color. It was terrible, and after trying a bunch of different products I finally bought Natural Chemistry 07395 Extra Strength Stain Free. I simply added it to the pool, ran the pump for 15 minutes to 'stir' and then left it over night. The change the next morning was beyond remarkable - The pool is sparkling white. Your mileage may vary, but I am so pleased that I tried the product as I had almost given up. You will need to bring your chlorine back up slowly over the next couple of days as the treatment will flatten it. Also remember to clean your filter before the process and regularly for the next week. Some additional thoughts - - This works on metal stains, and you can test for that by buying some Vit C tablets from your drug store (white, crushable). It the stain fades when you rub a tablet on the pool wall then this product should work. - It will begin working immediately - My steps and floor near the pool walls cleared in 5 minutes - but it takes time for it to work across the entire pool. I ran the pump to mix the treatment in, but that was not something they stated in the instructions. - My pool was heavily stained so I used the entire treatment. - The 'after' pictures are the next day, about 24 hours after I added Stain Free. - Although there is nothing in the product instructions I have read that rapidly raising the pools chlorine and alkalinity can drop the metal back out of solution. I have raised it more gradually without issue over a few days. - $30+ for what is basically 2lb of powdered absorbic acid (Vit C) is expensive - You can buy an 8lb tub on Amazon for less than $60. If you don't think you will need to do this regularly then it is probably still worth it (I would have paid double, and I was quoted $300 by a pool company for basically the same thing). If you are in a high iron area and need to refill often then you can do better volumewise with your $.

Worked great. Immediately removed all the old and new stains due to high level of iron in our well water. I let it sit overnight with pump off and the water and the pool was crystal clear. Wish I had used this earlier.

In a word: Amazing. I had severe calcium silicate deposits on the entire deep section of my Vinyl pool. This was a relatively new liner and I was considering replacing it. I tried many products and brushed it rigorously for weeks. This product dissolved it within minutes of application. It removed 100% of the hideous stain and it literally looks like it did when installed. I was in complete shock. After trying Scaletec, muriatic acid, lowering PH, and nothing even scratched the stain. This product eliminated it within minutes. Again, Amazing. Looks like new now. Picture is from before and shows the issue I had.

WOW WOW WOW My pool was very rusty and brown when we opened it this year. The liner is several years old, but I thought I would try this and it worked!! My pool looks clean again. Very satisfied! I followed the directions on the bottle.

I have a 30 year old gunite pool with metal staining along the sides and bottom. Followed the bottle instructions to a T including adding a cellulose filter aid (Leslie's) to my sand filter. As most people have said, it was like magic! I went inside to make coffee and when I came back the stains were nearly gone from the bottom and my pool looked brand new. Super encouraging! Here's where it got a little tricky: before I put the Metal Free in, the pool became a milky blue color and I couldn't see the bottom anymore. I contacted the Natural Chemistry Chat and they told me to be patient and that the cloudiness is expected (wish it said that on the bottle!). They suggested a very slow chlorine increase (I'm using pucks) and if PH is low, which it is, to slowly add increaser but not overdo it. I took their advice and didn't add anything - no chlorine, no ph increaser and let the pool sit for the first 2 days. Today is the 3rd day and the pool is definitely clearing on it's own. I've also added more filter aid to help the process and a CUlator pouch to my pump. I haven't used clarifier yet but expect by tomorrow, the pool will look even better. I was worried about algae but can take care of that after the stain product has totally worked. The key is to be patient with the process.

Outstanding! Results in less than 1 minute on our steps! I wish I took video of this. I poured some directly on our steps and around the walls of our 16x32’ in ground pool with vinyl liner. The steps, water outlet jets and skimmers were bright white, immediately! I ran in circulation mode for about two hours and let the pool sit overnight as well. But, didn’t really need to go that far.

Stains gone! I have well water which caused a few iron streaks on the bottom of my pool. I put two bottles of this in and within minutes the stains were gone!

This is a great product. Just make sure you have your water chemistry according to the directions

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