Spa Frog Filter Mate - Year's Supply 3-Pack

not sure what is in it but silver is what I want. This works well in a 500 gal hot tub so i only use a tablespoon of diclor when i exit the tub.

I always use these or similar

Best price I've found (usually buy 3 at a time for the year) and they keep the water crystal clear. We pair this with some simple bromine tabs - which dissipate slower when using them with the mineral filters!

I like to use these in my swim spa and my hot tub they seem to work as designed

These really seems to work, but I have gotten a cople that have had loose particles floating around in the box. One of these turned my water cloudy the first day I put it in. The others have work great!

Been using spa frog mineral sticks for years! You can really tell the difference when one runs out and you replace- water feels so much nicer!