Use a reliable pH test kit and keep water pH between 7
If the surface is black plaster
Fill the filter tank with a solution of Poolife Filter Cleaner in water: Either prepare the solution as above in directions for use and us the pump to feed the solution through the pump strainer (requires 7 to 20 gallons of water) or add directly to the filter or directly through the skimmer
Inground Pools
5% C12 and 5% C18) dimethyl benzyl ammonium chloride
Sundance® Spas 680™ Series Filter (373045) Bracket Pillow Use a reliable pH testSundance Spas 680 Series 50 Sq Ft Filter, Part #373045 or 373045S Fits the following Sundance Spas: 2012 680 Series: Peyton, Denali 2013 680 Series: Hawthorne, Hartford, Peyton, Edison, Denali 2014 Current 680 Series: Hawthorne, Hartford, Mckinley, Edison, Peyton, Denali, Romona, Prado Original Sundance Filters, No Generics.