Ok. That makes more sense to me now. That filter system was designed for one spigot drinking water use only. Do you not have a "whole house" filter system in one of your bays? If not, pick one up and install it and then you can do totally away with that compact filter system. I think if you go back and take a look at a post you made back in Oct. 2012, you will find that recommendation from some others. If that was the only filter system installed from the factory, I am really surprised that it was hooked up to the kitchen sink. I understand the drinking water only faucet and the ice maker as that .5 fpm flow would be fine. No doubt you had very restrictive flow using that system with the kitchen sink faucet. Here is the link to your original post about this problem. Thanks for your patience in further explanation for me.
Post in Oct. 2012