I bought this item for my Apec RO Stage 1. These filters were a lot cheaper than the OEM filter and fit perfectly. They were lighter than the OEM filters so I don't expect them to last as long, we'll see. I got them cheaper and quicker than the OEM filters, so for now I'm satisfied. My TD meter shows no drop in performance after switching to this filter. The real test will be to see if they last as long as an OEM filter that costs more.
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