Periodic ProductsCUL-ULT CuLator Ultra PowerPak 4.0 Metal Eliminator and Stain Preventer for Pools

The cuLator works way better and lasts longer than typical hot tub solutions for removing metals from water. Makes our tub water crystal clear, and when added promptly after filling the tub, prevents rust "high water" marks. Great gadget.

My pool water has always been high in copper. After a few weeks, the bag was very blue, indicating copper bonding. Balance is back in range.

Work great just little too much on the valve

It’s one week working in pool skimmer, picks up debris. Works good, pool is clearer

I did a chemical cleaning of my well pump, and the water turned iron-heavy for several days. I also have an old 1940s pool that leaks, and because my well water is so plentiful—it produces 100 gpm, not a typo, 100gallons every minute, we are on volcanic springs—I’ve been adding about 1,000 gallons per day to the pool to keep it topped off.I am telling you all this because overnight, my 5 foot deep 1940s leaky pool went a dense dark brown. I knew it was the iron. You couldn’t see through the water, not six inches. The pool has a 10,000 gallons capacity. At first, I bought a new filter and ran it. Over two weeks. No improvement whatsoever. The well water had gone clear again by that time, but the pool was still a dense dark brown, staining the walls and ladder and anything that came in contact with the water.I was going to drain the pool and start over. Then I researched and read and asked around, and found this product. I got the small one, $30 at the pool supply store, $20 here on Amazon. The guy said it might take a month to clear. Put it into the spin drain. Two days later the water was improved.So I got on Amazon and spent $50 for the jumbo. If the small one works in a month the large one should work quicker, no? That’s what I figured. It arrived the next day, early, and I tossed it onto the main strainer basket on the pump. Within 24 hours, the water was so improved, we swam in it. Now, five days later, it’s crystal clear.This predicts works, IF your problem is indeed iron in the water. If the one stars folks say it isn’t working, I question if their problem is iron.I will always use these from now on. I went into so much detail in this review, because I’m convinced that for the one star crowd, they either aren’t using it correctly, like not a large enough one. Or maybe their problem really isn’t iron. I knew my problem was iron.I will always use this product from now on. And when I feel like spending $10k, I’ll re plaster the pool and stop adding 1,000 gallons of well water. Till that time, I know that this will remove the iron color and I’ll be good to go swimming.