FROG Serene Mineral Replacement Cartridge + 4 Bromine Cartridges for Hot Tubs, for use only with FROG Serene Floating Sanitizing System for Spas up to 600 gallons, Quick and Easy Hot Tub Sanitizer

Product is good but overpriced. Due to delay in delivery we had to find this poduct at a local pool store. The price was 40% lower for the green bromium cartridge which contain 25% more bromium. The yellow cartridge contains 150g and the green 200g!!! The blue cartridge was almost 50% cheaper.... Bottom line buying at a local store would have us save 100$. Never again!!!

If you have a frog spa theater this product works great.

Easy to use

These are excellent as a quick and simple way to add minerals and bromine to your spa if you have the Frog system. However they are fairly expensive for the convenience. Protip! When you are done using one of the bromine cartridges, you can pop the top off (several tutorials online) and refill them with your own bromine tabs. This will save you a ton of money down the road.

for hot tub- works as expected