I answered in your other thread but basically its a low end drinking water filter not reef quality. With RO/DI you really do get what you pay for and a reef quality system should start at about $135 and up new. With all the necessary bells and whistles like a TDS meter, pressure gauge, bypass valve, thermometer and more you are looking at $169 out the door. Much higher quality components and filters and much longer DI life.
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