Fresh water flush

Your zincs won't do much if anything in fresh water

I read that as one of his points, flush and fill with FW and the zincs last longer. That must save at least $20 a year.

Touchy, touchy!

If you came for answers you got them, if you don't like the answers that is not indicative of a "dickish attitude."

If you want support for an idea or project that has few if any upsides and several downsides then go to one of the toyboat sites where they thrive on stuff like fuel polishing systems, buttock lines, anchor types, how to connect and charge batteries, and what their boats are called.

Jrms80-
Your solution is not solving any real problem; it is adding more complexity to a system which needs none and it's introducing items which cost money and could fail. The main engines pick up raw water from a seacock- are you putting a "Y" or a "T" in the pick up hose plus a valve which is then adapted down to the size of the fresh water hose? There's about another dozen questions but no need to ask or answer them- your idea causes more issues than it solves. As a professional sportfish captain for 20 plus years I can tell you no one else with any length of experience does what you are suggesting, and for good reason. Your idea here is not worth the time if the boat sees 100 hours a year or 600.
Plenty folks will show up on the dock or here in a forum and tell people what is good and wise; however they have yet to gain the experience to know what is good and wise. Those folks ideas are shot down and predictably they tend to get upset- as you are. Get over it. Yes some ideas merit consideration and also predictably those are debated- your idea is not one of those. Every boat has a nearly unlimited number of items which could be cleaned, made shiny, maintained, fixed or paid attention to: go find those on your boat instead. Ask about other things and we'll answer your questions without prejudice.

I will try and be nice ... first off, I was responding to K1W1, not you. Secondly, saving $20 a year is $100 every 5 years. As Mr. Herbert said once, "A penny spar'd is twice got." Why that should offend you is not worth discussion here.

Just because you don't like the information you asked for does not mean those who supplied it are being "dickish." Take Bamboo's advice to heart and you might learn something. If you are here to insult people rather than benefit from knowledge and experience freely offered then good luck with your future boating activities.

What you want to do is a fix in search of a problem. In order for saltwater to corrode things you need oxygen present (air), without that component the saltwater doesn't corrode metals. Having freshwater sitting in there, really isn't going to change anything. Same for the engine zincs.

My thought would be to do it if it gives you piece of mind notwithstanding it may or may not work or create more problems. Only God or fools can be sure of results.

For what it's worth. I had also heard of installing this system as a few people have done this. At first glance, it seemed like a great idea but after thinking it through and reading some of the comments here, I agree that it's not enough of a gain to warrant the expense and complication. Great for an outboard etc. but for the very minor potential gain... No real shortcuts for just good old fashioned servicing.