Unicel C-4405 2-Pack | 50 sq ft Rainbow DSF Spa Filter Brand_Vermont Castings Pro Tip: Bromine tabs need

Pro Tip: Bromine tabs need a head start

and it consistently backfires

SimpliFire Electric Insert 25"

Ooni Pizza Cutter Wheel

This kit handles both in the right order

Unicel C-4405 2-Pack | 50 sq ft Rainbow DSF Spa Filter Brand_Vermont Castings Pro Tip: Bromine tabs needThe Unicel C 4405 is a matched pair of replacement filter cartridges delivering 50 square feet of combined filtration for Pentair Rainbow Dynamic Series IV systems and Waterway skim filters. It is sold as a set of two because the system is designed around two cartridges working side by side not because two is a convenient bulk quantity. That distinction matters more than it might sound. These housings run a pair of compact cartridges in parallel