I have evidence of minor interior corrosion and have re-organized my grounding system to better address the issue. I also have had difficulty in determining the best way to mount my aft bilge pump automatic float switch. I decided to mount it to a piece of zinc, removed form the rudder before repainting the bottom. It fits snuggly against the forward bulkhead in the engine room, just in front of the pump. It is heavy enough to hold the switch secure and should provide additional corrosion protection on the interion of the hull. I was wondereing if anyone had thoughts.

My shower drains into a plastic catch basin which has its own bilge pump with float switch. But I will make sure I'm not getting some residual drainage. Your mention of chemical corrosion made me think using a cleaner with corrosive properties (I understand my beloved Simple Green may have) might be one my causes??? The corrosion is very minimal and is showing up above the bilge water line.

I am no electrical genius so take what I say with a few grains of salt...but I don't think the zinc will solve any galvanic corrosion problems in a dry area. It works dunked in seawater where two dissimilar metals are acting like a battery and one of those metals is sacrificed to the other. The zinc's purpose is to be the sacrificial partner, giving up metal as the electrons flow from one metal to the more noble metal.
I think I have that right.

In dry places, there's no "battery action" as described above.

I have signs of white fluff in the same area, almost 100 percent dry. It's something else..perhaps, just as Jeff described. I don't consider it serious.

By the way, I leave that shower sump pump on all the time because that's where the air conditioner condensation water goes and in the past I have forgotten to activate that pump which makes for a wet forward bilge. So when the batteries are on, the pump is, too and when we run the AC, that condensation is dumped overboard. The pump runs for a few seconds periodically.

Gee guys..Better have this stuff analyzed. You might get arrested for it.

But "Shower Water" ???
What the heck would be in shower water that would be corresive? Could the Admrial be using a little too much drain-o? Other than that it would be fresh water, soap, bodily fluids... Maybe an unsealed bilge pump or other wiring laying in the puddles. Got to get my thinking cap on.

Oh !!! Come on Jeff, don't scare the be-gee-bes outta Jim, bathe soap’s like Dial, Dove, or Ivory aren’t gonna eat the mans boat out from under him all it probably is, is a calcium build up that can be cleaned up with a tub & tile cleaner like Soft-Scrub or the likes or if it’s been there awhile a heavy weight cleaner like CLR will do the job then rinse down good & let the forward bilge pump take care of the excess water.
The reason for the overflow may have been caused by a dirty filter in the sump tank I didn’t know there was a filter in that sump till 2 seasons ago when my holding tank ruptured & had to take up a lot of the decking in that area (for a really crappy job) The filter had not probably been cleaned since it had been put in new It’s around plastic cylindrical tube with about 1/8" square holes thru out it’s 6"/8" length clean all the hair & scum off the filter (it comes out) clean it dockside & U don’t make a mess aboard replace it & there shouldn’t be a problem with overflow till the filter gets dirty again all depends how often the shower is used.

Norm,

Bigs Live On

Jeff,


AH !! Yes soap to cleanse the outer body parts And some BREWSKI’s too flush & disinfect the Innards ones That’s what keeps a Ole Salt going & his vessel purring & on a straight & narrow course.



PS :) B T W Happy PACKI DAY (Fat Tuesday) Too All, U too Jeff

Norm,

Big s Live On

You can e-mail me the photos and I'll post them for you.

Jeff

A bit small, but here's Jim's float switch photo.

Jeff