2 Pack Swimming Pool & Spa Stain Remover (4 LBS Total) - Natural & Safe, Works for Vinyl Liners, Fiberglass, Metals – Removes Rust & Other Tough Stains Without Harsh Chemicals

Very good ,,did the job. I'll buy it again if I need to

So I see some bad reviews of the product. Likely folks who aren’t: Patient Using it correctly Using enough Using for right reason Because I have used at least 4 bottles in the last couple of years and it is exceptional. When you Uber-shock the pool, like a SLAM that has FC at about 10,000!!!! You will plate the pool. The pool will turn brown and you will be angry. Algae gone yes, walls and floor and steps now cocoa brown. I thought it was metals but in my case it has always been a stupid learning curve on a proper SLAM and detecting when algae is actually alive or when it’s dead and just needing removal from water. Always: at pool opening in March or April! On my last plating of a Catalina Fiberglass pool that was exceptionally blue, I opened the bottle and cut a small triangle opening maybe 1/4 inch tall and 1/4 inch wide. Use the bottom to sprinkle the acid as close to the wall of the pool as possible. This puts granules and high density citric acid right on the affected area. It’s not usually instant especially if plating is heavy, but I have seen it erase the wall instantly on very mild problems. I treated the steps at 6 pm. I waited until 8 pm and inspected. No results. I salted it again, but this time a small bolus was dropped at the middle of the top step. Still no activity. 10 pm, nothing. I go to bed knowing that plating is bad. 6 am, look outside, there is a nearly iridescent blue skunk stripe from the top step down to the pool floor. I retreated the NOW thinly plated steps and shallow end walls. PH had risen and the bolus had by gravity washed its way down about 6 feet past steps. Home from work at 5 pm, found the entire shallow end walls very thin, steps completely clean and blue, stunningly so. I used the balance of the bottle to treat the shallow walls to midline of pool, hits the corners heavier, step vertical faces. While I was working outside the pool simple snapped blue to the drop off. Period- end of story. The second bottle, half was used for the deep end walls BUT- the acid had crept to the deep end and thinned the plating slightly already. The deep end is always more difficult as the acid will settle to the bottom radius and not stick to the walls. That’s ok. The whole pool with 1-2 bottles used will, in a matter of a day or two, be completely clean. Anything above the water line: like you let the water drop before treatment or the foray two inches that usually don’t get concentrated enough—— Mix in a bucket a few ounces of the acid with 1/2 gallon of water. Lower your water level to explode the entire upper region needing treatment. Let it stay dry. Do not splash water on it. Use a 1970s sponge mop, soak with acid, mop the walls but don’t dip the mop in water. You want full concentration. Let the sun see the all’s for a bit if you can. Heat intensifies acidic reactions as a catalyst. It can’t hurt the walls at all! Mop repeatedly round and round trying to keep the area damp with acid solution. I’m two passes at noon with good sun, you will see a clean wall like it was painted. Hose the wall down to rinse acid, restore water level above the normal line, adjust your PH and Alkalinity back to correct. Then don’t shock the heck out of your pool again! Ascorbic acid will best remove iron/rust stains. Similar products are avail in ascorbic acid. Same application, including the mop. It will too clean the walls the same as citric, but more expensive. 4-6 ounces of HCLin 2 gallons of water will do the same BUT——- you better be on your game for PH and Keep chemistry up. The HCL will perform as well or better than both alternatives but it will also expose the pores of the gel coat and you will likely plate easier heretofore. The stuff is a miracle drug for the pool. Be patient. Leave the pool pump off and stagnant clean correct PH water to start and leave it as needed for two days to get the performance. It’s not a microwave oven!!! See ya- I need two more bottles for 2023 just in case.

Wow! Ma piscine creusée était complètement tâchée suite à un problème de réaction chimique dans l'eau. J'avais essayé tous les produits vendus chez club piscine et Trévi. Je pensais devoir changer ma toile. Elle est redevenue impeccable.

I was skepitcal at first i put in one container didnt see much improvement added second and that sure cleaned up the stains on the liner from iron

Works well but need to double the dose and let it works for a minimum of 24 hours (recirculating mode and brunch, then back wash).