King Technology FROG Serene Sanitizing System

Instead of relying solely on bromine, this system uses a combination of minerals and a low level of bromine. The minerals do the heavy lifting to sanitize the water, which allows you to reduce your bromine usage by 50-80% compared to standard hot tub chemical treatments.

The FROG Serene system is specifically designed for spas and hot tubs up to 600 gallons. If your hot tub exceeds this capacity, the system will not be able to maintain proper sanitization levels, and you should look for a solution rated for your specific volume.

You don't have to, but it is recommended. The floating holder is designed to be easily removed when you are in the spa, which keeps it out of your way and prevents it from getting in the path of the jets.

Yes, many users notice that water treated with minerals feels softer and less harsh on the skin compared to water treated with high levels of traditional chemicals. Because you are using significantly less bromine, you will also notice less of that typical strong chemical odor.

The system uses replaceable cartridges that snap into the holder. You will need to monitor your water chemistry regularly with test strips to determine when the mineral or bromine cartridges are depleted and need to be swapped out for fresh ones.