PoolRx+ Mineral Algaecide Unit, up to 6-Month Algae Control, for 100-400 gallons, Yellow & White, New Formula with Silver.

Love this! We use this in our oil and cold plunge. Have been for a few years now. It actually works really well, and there is an option to use less chemical chemicals in your water.

We switched from bromine to Chlorine after using one in our pool was such a impressive change. My skin feels so much better than when i got in the spa with bromine it really helps keep our spa cleaner, and the water FEELS cleaner

This is a great product for keeping the hot tub clean, clear, and non gritty.

Worked very well and I'd definitely use it in the future.

Very good product. Used in our hot tub we were out of town for a couple weeks came back and algae 🙄. Except for chlorine the chemicals read good changed chlorine cartridge and didn't fix the problem so after a couple of days and ready to change the water. I ordered this yes the water turned a little blue at first but better than the green it was prior. But then after a day or so the water cleared. Will definitely buy again and definitely use before we leave on vacation again.

Dissolved well.

This product caused a blue ring to develop in our hot tub. The container also oozed a blue gel. Will not be using. Tried to contact seller and have yet to be contacted. This is inexpensive for a reason. Buy a quality product instead of this flawed product. Just heard from seller. Told me to get refund from Amazon. Not possible because date for return has past. Essentially I was told it was my fault that their product caused the issue. This was an insulting response. Buyer beware.

We keep these on hand for our hot tub. Has kept that stagnant water odor and slimy feel away for sure. We will always use this product for our hot tub. Easy to use and doesn’t bother my sensitive skin.