Pristine Extra (25 lb) Pool Alkalinity Increaser Spa Perfect's patented natural enzyme

Spa Perfect's patented natural enzyme and botanical extract formula powerfully yet gently biodegrades body oils

Apply dosage weekly to prevent scale and stains

algae and trouble-free

turn the skimmer basket back over

Using Filter Cleaner regularly keeps insoluble particles filtered out of the water

Pristine Extra (25 lb) Pool Alkalinity Increaser Spa Perfect's patented natural enzymeDescription Pristine Blue Extra is a chlorine shock specifically designed for the Pristine Blue Chemicals. It is typically added every other week, but can be added more frequently based on your bather load or if your water requires additional shock treatment. Alternatively, you can opt for Pristine Power (a non chlorine shock) to shock your Pristine Blue water. With 99% Sodium Di Chlor as its primary ingredient, Pristine Extra for pools is an