I spoke to a Culligan service engineer and this person suggested using an awl (I used a drill) to widen the hole at the top of the filter slightly to allow for water flow to increase . He's humiliated by everything he's going through. With cheaper Culligan filters (D10 and D20) the flow is much higher but the filtration is much less. I don't trust municipal water anymore so I filter my drinking and cooking water with this system and have been happy with it and the customer service from Culligan.
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