Cannister Dissection Yields Surprises but Few Defects


Different filter manufacturers can chose different rating systems that rely on different statistical values for filtration. The higher the percentage at a given rating, the more effective. Interestingly, the effective rating changes over time, as particles clog up the media, making the holes smaller.

1. Like a cereal box that is mostly air, this Quicksilver cannister has a relatively small filter element inside.

2. The Volvo Penta filter is glued to the can, with slots at the base so the filter can drain into the bowl.

3. This Fleetguard filter shows the standard cannister filter construction. It is like an oil filter, but without pressure relief valve and without any drain-back valve at the bottom.


4. Used for attaching fuel lines in tight spaces, banjo bolts are notorious for plugging. This banjo bolt has been over-tightened and has distorted.


5. This Parker Racor filter was clearly doing its job.



Practical Sailor has been independently testing and reporting on sailboats and sailing gear for more than 45 years. Supported entirely by subscribers, Practical Sailor accepts no advertising. Its independent tests are carried out by experienced sailors and marine industry professionals dedicated to providing objective evaluation and reporting about boats, gear, and the skills required to cross oceans. Practical Sailor is edited by Darrell Nicholson, a long-time liveaboard sailor and trans-Pacific cruiser who has been director of Belvoir Media Group's marine division since 2005. He holds a U.S. Coast Guard 100-ton Master license, has logged tens of thousands of miles in three oceans, and has skippered everything from pilot boats to day charter cats. His weekly blog Inside Practical Sailor offers an inside look at current research and gear tests at Practical Sailor, while his award-winning column,"Rhumb Lines," tracks boating trends and reflects upon the sailing life. He sails a Sparkman & Stephens-designed Yankee 30 out of St. Petersburg, Florida.


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