I started of using a 4 stage Kent RO/DI unit and it worked fine for years. Then it was time to switch out all the filters and resin and I came upon Aquasafe on Ebay. They had their 7 stage system with 3 years of filters for only $120 and free shipping (I haven't seen this offer since). This was about the same price as just a change of filters for my Kent unit so I gave them a go. The unit works okay but it comes with and adjustable flow valve where as most system come with a fixed flow restrictor matched to the membrane. So after some adjustment you get it dialed in. After awhile I found this was not a set and forget adjustment, it would suddenly stop producing much waste water then you would have to reset it, awhile later it was dumping tons of wastewater and little pure water. I also wasn't keen on 3 stages of DI resin. I ended up finding an inline line flow restrictor with a valve for flushing the membrane built in for the Aquasafe unit but ended up putting it on my Kent unit and went back using that one, changing the DI resin is simpler as well on the Kent unit. Any 4 stage ro/di unit will work well for you and give you great water, some have lots of features and better waste to filtered water ratios but in the end all will give you the same product.
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