Before deciding whether to shock your pool after filling it, consider your water source. If there are no known issues with the water source, you can generally trust that there won’t be any harmful bacteria present.

If you suspect your pool was filled from a questionable water supply, it may be best to shock your new pool as a precaution. Test the water’s pH and chlorine levels before adding any shock to ensure it dissolves completely and doesn’t react with other chemicals in your pool.