FreshWater continuoes silver ion purifier, part of the Everfresh water care system HS uses. Along with ozone...directions
Prior to each use.. Add1 tbsp of mps to spa per 250 gallons
Once a week... Add 3 tbsps of mps to spa per 250 gallons
Every four months.. Drain and refill spa. Replace ion purifier and add 11/2 teaspoons of diclor per 250 gallons
As needed...If an mps treatment (either before use or weekly shock) has been missed, or if water is hazy,cloudy, or has an oder, chlorine should be used instead of mps. Add 11/2 teaspoon of chlorine per 250 gal.
This came right off the instruction sheet in the box.