Shock the pool
Destroy the waste products in the pool that can’t be filtered, such as rainwater and sunscreen by adding shock. As a best practice, use a pail to mix the shock before adding to the pool. For your safety, always add granular shock to water – not vice versa - mix and let it dissolve before using. Be sure to wait the required amount of time after shocking before swimming in the pool — usually one hour after non-chlorine shock and 12 hours after chlorine shock.