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Old 07-30-2018, 07:54 PM   #1
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Default Thru hull full of white stuff

Can someone tell me what the thru hull down in the right corner over the transducer is for?

It has strange white stuff covering it now. Trying to figure out what it is.
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Old 07-30-2018, 08:05 PM   #2
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Chalky white stuff. Had completely blocked thru hull.
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Old 07-30-2018, 08:17 PM   #3
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Probably your Macerator Pump thru hull.
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Old 07-30-2018, 08:22 PM   #4
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Very odd, it appears to be below your water line????
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Old 07-30-2018, 09:00 PM   #5
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Oh yeah. Macerator pump makes sense. Also explains why it was totally plugged and I didn’t notice.

White stuff was on that one and the inlet for the head. Both brass (bronze?)
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Old 07-30-2018, 09:41 PM   #6
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I cannot make it out on my iPad, can you get a closer in picture?
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Old 07-30-2018, 10:19 PM   #7
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Here’s a closer photo. Pretty sure it is macerator based on the diagram in the 2009 manual.

That is it after pressure washing. Guy blasted it out.

Second photo is my two month old zinc with over 50% wastage. I think the build up must be from the bronze acting as a cathode.
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Old 07-30-2018, 10:37 PM   #8
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That zinc is only 2 months old? I assume salt water based on your location. I'm a fresh water boater so no clue if that is an issue or typical wastage in salt.
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Old 07-30-2018, 10:42 PM   #9
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Yes, salt. I can't imagine it is normal. I'd have to pull the boat and change the zincs every few months! I should only have to change them once a year, and even then, should only be maybe 50% worn.

Something is wrong, either with my boat sending out electricity or one near me, I'm pretty sure. I found some stuff on the interwebz about people having rapid zinc wastage and chalky build up on props/shafts. Turned out they had a misplaced grounding wire.

Looks like I'm going hunting for stray currents, but until I find one, I'm blaming the grungy old sail boat beside me. All was fine until he came along...
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Old 07-31-2018, 12:21 AM   #10
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It the thru hull bonded inside?

Either you, the marina, or a neighboring boat has a serious stray current issue.

Anybody near you having similar issues?
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