Our simplest filter. The miniScrub with it's NSF61 listed greencarbon™removes 99% of chlorine and 90% of sediment from the feed water. The miniScrub is ideal for a wide range of uses and boasts a remarkable flow rate of 1 GPM—that's 60 gallons per hour! No more waiting for de-chlorinated water. The miniScrub is perfect for those who add expensive beneficial biological organisms to their grow media. The miniScrub insures that the complex microbiology flourishing in the grow media will not be destroyed by harmful chlorine. For those with tap water that contains chloramines, the miniScrub can be upgraded with a KDF/GAC carbon filter.