*HTH Chlorine* = High-Test Hypochlorite
It’s the strong powder/granules people use to disinfect water and pools.
# *1. What is HTH Chlorine?*
*Chemical name*: Calcium Hypochlorite
*Formula*: $Ca(OCl)_2$
*"HTH"* stands for "High Test Hypochlorite" - usually *65% - 70% available chlorine*.
That’s way stronger than liquid bleach which is only ∼5-6%.
*Appearance*: White granular powder or tablets. Strong chlorine smell.
# *2. Key Properties*
**Property** **Detail**
**Available Chlorine** 65% - 70%
**Form** Granules, powder, or 1" tablets
**Solubility** Dissolves in water to release chlorine
**pH** High ~11 - makes water more alkaline
**Storage** Keep dry + cool. Reacts with moisture/organics
# *3. Main Uses*
1. *Swimming Pools* - Kills algae, bacteria. Shock treatment
2. *Water Treatment* -