Increases total hardness.

Balancing your hot tub water is now simpler, faster, and more precise with FROG SooTHe®. Thanks to our exclusive FROG TruDose Cap™ and clear dosing instructions printed right on the bottle, you get the perfect amount every time — no guesswork, mess, or stress. Low Total Hardness? FROG SooTHe raises calcium hardness to the ideal range, protecting your hot tub from corrosion and scale while keeping your water crystal clear and your soak perfectly comfortable.