PoolRx+ Mineral Algaecide Unit, up to 6-Month Algae Control, for 5K-7.5K gallons, Orange & White, New Formula with Silver.

Great product. We had super fine algae that can’t be picked up with a vacuum. Just threw this in the pool and started seeing results pretty quickly. In about a week the results were perfect. Crystal clear sparkling water. Worth it

When I dropped the PoolRx+ orange & white 5k-7.5k gallons in to my pool I got concerned. It went straight to the bottom and let out a blue cloud of who knows what. But overnight it went to work and the next morning the thing was floating and there was a noticeable difference in the water and the liner was clearer. Works well and works quickly.

Any time you see "mineral" in pool supplies (mineral treatment, mineral cartridges, etc), it's code for copper.Granted, this also has trace amounts of silver and zinc, but it's mostly copper.This has a dissolvable formula in the middle (blue powder), then a copper ring on the outside.The formula will dissolve in 30 minutes or less. The treatment should last for +/- 6 months, but will eventually get filtered out.It's nontoxic. I personally wouldn't want to be in the pool when it dissolves, because it might stain your swimsuit or irritate your skin as it's dissolving. But there's no chemicals in here, it has no smell - there's nothing in here that's harmful.After the formula dissolves, the only thing that remains in the ball is a copper ring (yes, it's basically just a section of copper pipe). They say keep the ball floating in your pool or hot tub. I suspect the effects of keeping it floating in your pool are negligible, but it can't hurt.A common alternative to this are solar pool ionizers (which are also copper).The solar pool ionizers are a bit different - they don't have a dissolvable solution, and they typically don't have silver or zinc. But they are more effective because the solar panel sends a tiny electrical current into the copper, releasing tiny copper ions into the water.The solar pool ionizer is my preferred approach for outdoor pools, where you have access to sunlight. They will even work in shade, though obviously not as well.For indoor hot tubs and spas, this PoolRx is a good way to go.Either method works as long as you achieve your desired copper levels. They're easy to monitor but copper test strips are not always included in pool test kits.You can also just get powdered copper and dump it in your pool or hot tub. Even better, you can get a bottle of colloidal silver and dump it in.0.4 ppm is the upper range of where you want to be with your copper levels. Anything above that and you may have some slight bleaching to your pool walls, your swim suits, and maybe even some bleaching of blonde hair. But I've been using copper for a long time and never had a problem.PoolRx doesn't provide any guidance on copper levels. Their instructions are pretty simplistic - buy the correct size, drop in the pool, replace in 6 months.In terms of efficacy, yes copper absolutely does work to help fight algae. You still have to stay on top of your pool levels, it's not magic. But this enables you to reduce the amount of chlorine you use. Copper and silver have been used for thousands of years to treat water.4.5 stars