I gave this product the highest rating of 5 stars because they totally resemble the 'real' filters of a polyurethane water filter, they fit and install just like real filters BUT I have been using for a while Polyurethane filters countless years and I know exactly how much pressure the polyurethane filters put out with each pressure. I'm still only using the first filter of six and will tell you it's empty tank pressure. It's always taken me under 60 seconds to fill my 1/2 gallon reservoir, but now it fills up in about 20 seconds - the manufacturer claims the filters are filled with coconut materials. Maybe, but I just can't tell.
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