We had an "in-house" filter on the previous unit that constricted the water flow so badly that we couldn't get a glass of water. I was told that this is a "very rare" occurrence and that the internal filter cartidge was the wrong type for this application. I didn't know there was a difference. But then, I found that most folks I spoke with about the filter said to scrap it and go with the in-line style. After tinkering with canister type, I rigged a hose screw in and screw off on the outside of the canister and effectively made it an in-line filter. It seems that the hose from the connection on the inside of the unit was less than 1/2" O.D., and it should have been at least a 5/8" hose to accommodate the needs for pressure. Now, it works fine as an exterior in-line filter. Camping World even sells a stand for the canister. You do need a short 3' hose to go from faucet to canister. I may be living dangerously, but I don't need a restricter any longer. I've not found the pressure to be over 50 Lbs. on the flow side.