Tom:
Pygmalion - has two pre filters -- both were old and hard to change the filters and the drain was stuck closed.
I replaced one of the two with a Racor and use it all the time -- I find it fairly easy to change the filter and it sure does catch the "stuff" from the tank - I do keep an eye on the filters bowl and drain off as needed.
If the boat leaves for a long trip - the other one will also be changed out for a Racor - only one type of spare filters will need to be on hand:)
HTH Jay