No, you cannot use shock instead of chlorine to sanitise your pool water.
Chlorine is the primary sanitiser used to kill harmful bacteria, viruses, and other microorganisms in your pool. Shock treatments quickly raise the chlorine levels in the water to eliminate any organic matter, such as algae or bacteria, that may be present.
However, shock treatments do not provide a consistent and ongoing level of chlorine in your water. Therefore, they cannot be used as a replacement for regular chlorination.
