Swim Spa Serum Total Maintenance aids in the removal of bio matter build up. Designed as a weekly addition to your sanitization regimen for Swim Spas. Helps to flush out bio-matter your sanitizer can not. It reaches down deep into the plumbing of your swim spa to help prevent the reoccurring bio-matter & contaminant build up that is found in swim spas. One ounce per 500 gallons once per week is all that’s necessary. A 32 ounce bottle will last approximately 8 weeks in a 2,000 gallon unit.