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The center post was added to draw the wine from the bottom of the filter so you don't leave a filter full behind. I find it works fine to just turn the filter upside down. I don't have mine mounted and just do it by hand. If I mounted it I'd probably rig up something that I could turn right side up for filtering and upside down at the end.
I agree ^ with Greg
Please check out this post also
http://www.winemakingtalk.com/forum/f71/tips-tricks-using-whole-house-filter-37737/
There has been some updates on which housings and the correct filters you should be using