I have an xP3 and I'll admit it's not the most efficient best cleaning filtration device on the market but I don't understand how you come to the conclusion that the water flows around the filter media. The water flow goes down around the baskets and is then forced thru the filter baskets back to the aquarium. If the baskets are filled with filter material wall to wall, it seems it's bypass-free. Seeing your credentials in your signature, I'm defintely not one to argue with you. Help us understand why and how. Thanx.