This is an extra filter for your filters. It's awesome for families. It slides inside the larger filter and gets replaced about every 3 months. This makes a big impact on keeping our tub balanced. Especially when we have extra neighbors kids & friends over. We cut down big time on all the other cleaning and balancing products. It's kinda pricey up front but saves us in a lot of products in the end.

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!

Seems to help keep my chemical levels from bouncing

great stuff

It was very afortable. And it keeps my water super ,clean better than other products that cost way more.

Received my order quickly and was just what I expected in performance and quality.

I own Serene Mountain Escapes a property management company for vacation rentals and I have several hot tubs I take care of. I buy these for all of my tubs, and have definitely noticed a large difference in how well the water remains balanced. Even if the guests check out and the sanitizers are low, these will usually help the ph and alkalinity stay near desired levels, and also helps keep the water clear. I also love that they can be used with both chlorine and bromine as many others I have found are chlorine only. My spas never go without these, I love them!

great prices

The Frog Filter Mate sanitizer does a great job in my spa. And has saved me money on routine sanitizer.

Use in Spa. The prices are right. And I can find anything I need. Last purchase was a new cover for our hot tube. It is perfect also. Thanks Spa Depot.