We stock a full range of Omnipure USA Q Series Quick Change Replacement Combo Sets. These Suit Twin, Triple, 3 stage and 4 or 5 stage Reverse Osmosis Systems. The Q-Series is the ultimate “user friendly” inline filter on the market. Replacement of the spent media bed is completed , in a matter of seconds, by detaching the filter body from a permanent head with a twist of the wrist. The new filter body is just as easily threaded into the head, and the replacement is then complete. You are viewing our range of Omnipure Q-Series replacement filters with a diameter of 2.5” and lengths of 6”, 8”,10”, 12” and 14”.