I have been plagued by brown stains on my vinyl liner for 15 years. I can attribute the stains to my use of well water, and have been able to keep them in check through the use of sequestering agents and periodic doses of ascorbic acid. This year, sometime in late June, I decided to try CUlator, as it was displayed on the counter of my pool store and decided I'm already spending a fortune on these other products, why not give it a shot. I bought 2 of the CUlator bags and placed one in each skimmer. After a couple weeks I experienced no improvement as stains would start to appear about weekly when more sequestering agent was needed. I decided to buy 2 more CUlator bags and added those to my skimmers along with the originals. After another month or so there was still no improvement. Around this time I was starting to experience noticeable algae on the vinyl liner walls. This happens almost every year in late July in my locale (Norwalk, CT) as temps as well as pool use increases. Because of staining issues I have to keep chlorine at minimal safe levels, with an occasional splash of algecide. Slamming had always been out of the question as it would turn my pool brown. Well, in the first week of August I looked at the stains beginning to appear, and brushed the algae off my walls for the umpteenth time, and took the 4 CUlator bags and tossed them in the garbage in disgust. I decided I was going to slam the pool regardless of the staining, and see what happened. Well, the first evening of slamming, after adding 5 gallons of bleach to get my FC levels to 16, the staining appeared. This was the most bleach I had ever added to my pool at one time. When I woke up the next morning, the stains were GONE! What?? I figured that because of overnight chlorine loss the metals must have somehow gone back into suspension. Didn't think that was possible, but had no other explanation. FC did drop down to about 10 overnight, so added 2 more bottles of bleach, expecting fully the stains to come back. But no, they didn't. I continued slamming the pool for the next few days, and all has been good since. Even after adding some water from our well I have not experienced any staining, and I haven't added any sequestering agent in weeks. I'm very confused by this, as I do not think the CUlator product had anything to do with this as there was staining right up until the time I removed them from the pool. Unless the CUlator bags actually held the metal internally and that was what was causing the staining until I removed the bags from the pool? I am sitting in front of the pool right now, 3 weeks removed from slamming and it has never looked so crystal clear, with no signs of staining or algae. Anybody else ever have a similar experience?