I have put this up in another house and we both love it. Care is taken to replace the various stages after a year to prevent them from leaking, but we did. The last one we bought was for the microbial level 4 (which is added to another level 4 remineralization). This improved feature is very similar to the base model but costs about $40 more and is identified by a small change (the letters MCB) in the model number. Take the time to find it if you're looking forward to this add-on. We switched from Whirlpool RO to get this level 4. We designed and installed reverse osmosis water to power our ice maker, chilled water for the fridge and Keureg (to automatically fill the tank) automatically so we never have to hold it down. under the RO tap. Take the time to learn how to install and remove tube fittings (shark bite) as they should NOT be reconnected a second time without cutting off that small protrusion (about 1/4 inch) and then they can be inserted will. reconnect without leaks. Overall good design but make sure you have >>40psi pressure in your house or it won't work that well. Thanks to AO Smith and Revain. (ps they promised to send me $3 to write a review so I hope they got their money's worth. Blessings to all - we'll get through this together, trusting in God and not our own understanding .
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