Originally Posted by MedSailor
This makes sense! Thanks for that revelation!
It also makes sense as to why all my custom copper tubing and my bronze raw water pump and strainer are turning to green powder... Hmmm.... Methinks I should zinc the bits before the rubber caps.
Perhaps a stupid idea, but what about just dropping a zinc into the sea water strainer basket? Something like a half-eaten shaft collar zinc? Wouldn't satisfy the anal engineer in me, but it would satisfy the "get-er-done" part of my brain.
The zinc needs to be in physical (meaning also electrical contact for metal equipment) to work. The zinc is setting up a battery with the salt water being the electrolyte. Dropping zinc in strainer would do nothing as it is not in good electical contact with what you want to protect and it needs to be in close proximity (within a few inches) of what you want to protect. This is why some say the zinc fish you connect to your boat and drop over the side do nothing to protect your boat metals.