Product review (5 stars): Don't fool around with generic replacements -- get the real thing!
I think it pays to get original manufacturer's parts and pay (in this case) a few dollars extra. Screwed it in and the flow approximately doubled in both volume and velocity (which, as you physicists know, are related). And you should have seen the flotsam and jetsam in the old filter! Yuk! By the way, there were no instructions included, but I remembered that you are supposed to fill the filter with water before inserting. This may make a difference, dunno.