Periodic Products CuLator Ultra 4.0

The CuLator Ultra 4.0 is an absolute game changer. We use well water for our pool, and this has made a huge difference. It’s a simple, hassle-free solution that really works. Since using it, I’ve noticed I need far fewer chemicals, and the water stays incredibly clear. It’s saved me time, money, and frustration. If you’re dealing with metal-heavy well water, this is a must-have. I won’t maintain my pool without it!

Living in an area known as "The Copper Basin" in east Tennessee you can bet that we have a great deal of copper and iron in our water supply. After chasing what I thought was algae for weeks with any number of products this little jewel cleared up my pool overnight. The attached photo is of the bottom drain in the pool as seen through almost nine feet of pool water!I highly recommend this product if you have metals in your pool water.

Works great

I use this in a 25,000 gallon pool so I also have to use stain and scale. This only covers up to 10,000 gallons I believe but with stain and scale and phosphate remover it seems to all help keep that black line away where the water level is. This was recommended by a pool professional.

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.

Not certain if this is working or if the metal out has done the job. I bought this device after trying to brighten the pool plaster with an ascorbic acid treatment. The vitamin C did the trick but light brown plaster staining came back a bit even after adding both a metal out sequestering agent and this culater. The culater is in the skimmer and has swolen up but is bright white in color. Pool testing comes back with zero metal. Maybe the stain is just dirt?My advice is to test your pool water for metals BEFORE buying this product and then test again after using the product without a sequestering agent to see if it really works.

My pool was still very green after increasing the Total Alkalinity from 50 to 100 and reducing the pH from around 8.0 to 7.4. Research indicated the high pH could have oxidized some of the metal in the equipment, coloring the water a nice shade of lime. I put the device in the pump strainer, and three days later the water was a healthy blue again. My wife was very impressed that I figured it out without calling her brother (a pool builder/servicer).