Two meter troll wrote:

four filters. two sets paired with a y valve so you can run through
one or the other in the set. it would save you changing out filters in
bad weather (which IME is when filters clog up) or while running.

That would certainly increase redundancy but, so would a third set of
filters. It has to end somewhere on a 32 foot boat.

The reason filters clog up in bad weather is because the motion of the boat
stirs up the stuff that's been sitting in the bottom of the tank. The whole
point of the polishing system is to remove that stuff before you get into
bad weather. Before bad weather or going into a spot where power is vital,
it would be good to take a peek at the filter gauges to see if they show any
restriction. This would be an especially good thing to do with a new load
of fuel.

With the high capacity of the Shelco filter, it's pretty unlikely I'll be
changing elements underway.

--
Roger Long