454g HTH Extra Super Shock

FEATURES & BENEFITS
FAST ACTING AND POWERFUL!

15% Stronger than regular HTH Shock!
Contains 75% available chlorine.
Fast dissolving, EXTRA FINE, formula is made from a patented process.
Ideal for weekly shock treatments and killing algae.
Calcium Hypochlorite
Always test and ensure pH is between 7.2 and 7.6 before shocking
Test chlorine levels regularly
Shock after heavy use of pool and after rain as rain can introduce organic contaminants