OK - for the truly paranoid (and to make life easier)... If you are worried about clogging filters - why not have quad Racors (10 and 2) and dump the engine mounted filter which is a PITA anyway, and seems to be what everyone is worried about. On the more serious side - for real life - the people with the biggest problems are those that never or rarely move. Deliveries for non-moving boats are always the worst - they may burn through a case in what feels like no time. I've changed more filters in yachts, than I have on commercial vessels despite much greater run times on commercial vessels. Otherwise keep your tanks clean, a box of primaries, and a few secondaries around. 30 or 10 primaries - your preference - and fuggedaboutit if your fuel is clean and dry! There are many more things on your boat that WILL go wrong, until you are a dock condo - in which case everything will break when you finally move the boat! Now back to your regularly scheduled program - A/C pumps Dave Legrow T'III (My summer home - the dock condo - it doesn't go too far) commercial - not revealed) - 65000 gallons a year on my rotation. Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com