Spa Frog Serene Refill Cartridge Kit

While a little spendy, it will last for my spa for a reasonable amount of time, like $25 to $30 Ish $ per month Product works very well, consistently.

Makes it pretty easy to cotrol the chemical levels.

Makes it pretty easy to keep your chemicals on track. Just put them in the float and keep an eye on your readings.

Frog refill cartridges

The Frog refill cartridges, mineral & bromine, are easy to use & effective