Sani-System is the only EPA & NSF approved sanitizer for use in water softeners and reverse osmosis units. It’s proven to kill 99.99% of harmful bacteria without the use of chlorine, oxidizers or acids that can harm system equipment parts and resin. The exact pre-measured doses of concentrated formula are contained in Ready-To-Use packets and sanitize equipment in 60 seconds! For reverse osmosis units, simply remove the cartridges and place the packet contents in the first housing and flush. Sani-System is the only sanitizer on the market proven by the WQA to safely sanitize an RO unit membrane.