Like all RO membranes you do need pre-filtration, ideally at least a sediment filter and a carbon block filter. You will also need an adjustable valve to restrict the waste during production and to allow flushing when needed. You will obviously need hosing to connect all of the above. If you're in a low water pressure area (-50 psi) then you may well need a booster pump, something like a 150 psi Shurflo will do the job well and an In-line TDS Meter may be a useful addition.