Serena SPA Instant Cartridge Cleaner ^Sale

Easy to use, spray-on, let set 3-5 minutes, and rinse off; no soaking or scrubbing required! Our Serena Spa® Instant Cartridge Filter Cleaner removes scum, oils, minerals, and scale from spa cartridges improving filter life and water clarity. This special liquid formula works in minutes so you can continue to enjoy your spa. It is recommended that you use it every 4-6 weeks to maintain filter efficiency.