Membrane, carbon & pre filter change schedules will be very dependent on the source water, which can differ greatly according to where it comes from. i.e. where you live. No sense getting too hung up on numbers from manufactures that are based on specific conditions which may or may not correspond to what will actually happen when you hook their unit up to your water source. Many variables, temperature, pressure, TDS, chlorine, chloramine and on and on. Most units are built using relatively generic components as far as the housings go. Whatever you decide on, make sure the membrane & carbon block are premium quality. The rest of the hardware is generic 10" stuff with each manufacturer simply stamping their name on it. I think some manufacturers individually test the membranes before assembling & shipping their units. This comes at an extra cost & if you're willing to bear that, go for it. For most of us, a brand name membrane will do just fine.
|