I bought this for my spa enclosure. It works, but it takes me three or four tries to install it properly so it doesn't leak. I'm a contractor, replacing this filter is a lot harder than it should be and harder than a name brand product. However, once it's in place, it does a good job of filtering out the bad odors we might be getting. Ours is good and lasts as long as any other brand we've used. It just needs to be 1/16 inch shorter.
Filter under the sink Aquaphor Favorit ECO silver
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NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
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