Monaco designed it right. They filtered all the water that was going into your food, drink and mouth. If you have the right filters and they are clean, look elsewhere for the blockage. Most of the time it is the filters but sometimes the screen in the faucet outlet is the problem. Monaco also designed a separate ultra-violet treated system that fed a faucet on your sink for sanitizing you cups, countertops, etc. This was available as an option as was the insta-hot system. Most of the 10" filters handle 3 -4 gals. per minute flow with some down to 1 - 2 gals per min. I have never had a water flow problem on my 05 system unless the filters were clogged.