Water Softeners and Air Filtration Systems - water pressure problem after mark 100 install

I am having water pressure problems after installing a Culligan Mark 100. Does anyone have any suggestions as to what can be done to get my water flow to normal. It was fine before the install as was the water conditioner.

The Mark 100 was working before. When I put the conditioner into bypass mode the water pressure is still low. I have excellent water pressure to my ouside lines that bridge off the line before entering the water condition. All lines are attached correctly and I am getting soft water, just very low water pressure. If I turn on the bath and a fawcett I barely get water out of either

Are you sure the "inny and outy" connections are correct?

Was the Culligan Mark 100 working properly before you installed it?
Where did the Culligan Mark 100 come from?
Was it treating water that was really hard with iron?

The more details you give the better advice you'll get.

It's been about four years since the last of the MArk 100's rolled out. As justalurker mentioned, where was the unit previously installed? Your low pressure problems initially sound like chlorine fouling of the resin but if you experience poor pressure with the unit in bypass, check the condition of the bypass valve.

Art