Pressurized Seawater Supply

[Dockhead]

Most fresh water toilets can run on seawater as well -- if you have a pressurized supply of seawater.

My "other boat" (actually my friend's) has this -- a normal water supply pump which is normally on just like the fresh water pump is, and pipes to all of the three heads on the boat.

Only problem with this is that if any one of those pipes leaks, you can sink the boat, unlike the case with pressurized fresh water.

So what is best practice?

1. Electric solenoid valve which shuts off the through-hull whenever seawater is not actually in demand.

2. Shut off the pump except when seawater is actually in demand. Maybe put the pump on a timer so it shuts off automatically after a couple of minutes? With a switch to shut it on at each appliance?

3. Vented loop(s)?

I'm considering installing pressurized seawater to supply:

1. Two otherwise fresh water toilets
2. Anchor wash
3. Seawater in the galley sink

Four appliances would seem to justify the hassle of installing it, and I will have a free through hull and vented loop after I replace the toilet in the forward heads this year.