Just so you know, Brand names for these units, are just that, Brand names, they almost all use the same membrane (Dow Filmtec) & the sediment, carbon block & DI resin replacement cartridges are pretty standard, again maybe different brand names but the housing size is the same, sediment filters come in different micron sizes 1,5,10, etc but are a standard size, you choose which one you like, carbon block, same thing, DI resin is usually color changing (dye) or not, but they are all made up of the same two components, Cation & Anion, in other words, the same across the board no matter the brand. What is important is 4-5 stages, (I use 4) flush kit, to lengthen the life of the membrane, & the GPD of the unit, 75 GPD is widely considered the best because of the waste to pure water ratio, this is what I use as well, I bought my unit a hundred years ago & I couldn't tell you what brand it is if you had a gun to my head, I've interchanged canisters & housings & hoses more than a few times, but the water coming out is ZERO TDS...the only real important thing. Find the best price....... inline TDS meter & pressure gauge are handy but not absolutely necessary, sometimes the handheld TDS meter is cheaper if you don't already own one.
I know some of the RO/DI unit sponsors are going to chime in & give me crap, but I speak the truth.....the only thing I did not mention was chloramines, that changes your specs a bit too, typically 2 carbon blocks which then becomes a 5 stage.
