I plumbed these together with the filter before the softener with a sediment cartridge both mounted in a milk crate, from the softener to the onboard filter with a charcoal cartridge, we've drank the tap water everywhere we've been, made coffee/tea, & makes crystal clear ice cubes. No hard water scales on the fixtures & makes showers/sinks easy to clean. The milk crate is a bit heavy/bulky but the system has worked well for us. The softener has to be recharged, depending on incoming water, about 3 to 4 weeks with 1 box of table salt & about 20 minutes.