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For pressure filtration you'll need a separate filter on the foot pump line.
Im somewhat a 'filter expert' and I pose the question/comment: why do you want to put a filter on your boat system when its infinitely easier and more efficient to 'filter' the dockwater (filter(s) on the hose that you fill the tank) and thus avoid or minimize the particulate that *enters the tank*? Why allow particulate into the tank only to filter it when it comes out the spiggot, etc.?
If you remove such particulate (and some level/amount of microorganisms) in a 'dock hose filter' and remove the 'organics' with a secondary 'carbon packed' filter BEFORE it goes into a clean and well maintained tankage (& occasionally adding the proper amount of clorox for 'bio-control'), then there is little need to put a filter IN the system.