Chlorine by FROG. Details:FROG Maintain non-chlorine shock makes hot tub shocking much easier. Twelve packets give you months of use! A convenient single-dose packet means you add just the right amount to your hot tub. No measuring means no mess no guess and no stress. It dissolves rapidly; in 15 minutes water is clean and crystal-clear. Maintain the clean without the chlorine!

Frog Maintain Non-Chlorine Shock Treatment for Hot Tubs Pack of 12 Quick and Easy Single Dose Shock Treatment Packets Chlorine and Cyanuric Acid
$49.81