Also check if your system has a 'flush' valve on it. Some systems incorporate the flow restrictor and flush valve in a single unit. It will have a lever similar to a ball valve to open and close the flush feature. This lever should be in the horizontal (not inline) with the assembly for producing filtered water. Otherwise all the water bypasses and 'flushes' the membrane.
If you could provide a little more info on the system, such as model number or gpd rating etc. we'll be better able to assist & provide advice.
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