Does the diameter of the water filter housing affect the flow rate?

I was interested in a water filter with a good flow rate (1gpm?) I saw on your website the Imperial Ultracarb Filter Cartridge and that it fits lots of “standard” filter housings.

I realize the Imperial filter is 2.75’’ in diameter and with more surface area comes increased flow.

Does the diameter of the housing affect the flow rate?
The diameter of the housing does not affect the flow rate, it's the input port that does e.g. 1/4" inlet will slow down, 3/8" is recommended. Our Regent system will give you good flow as well positive cartridge seal which can be found on the very bottom of the following page: http://www.doultonusa.com/HTML%20pages/doulton_filter_parts.htm