My wife and I own a 2019 Lagoon
42, Ocean Song. She is a 3-cabin owners version with three salt water
heads. All three heads have commoderizers, in-line chlorine treatment. The commoderizers work
great and we have yet to have any foul odors or calcium build up in our hoses.
We are thinking about plumbing
the heads so that we have the option of either salt water
or fresh water
flush. The reason is that in certain areas the raw water
can be pretty dirty. Just as there are places we don't run the water
maker, there are places I don't want the raw water
in our toilet bowls. In some marinas
for example we see water we don't want in our toilet bowls and occasionally in an anchorage there can be enough run off after a heavy rain for the water to be quite murky.
We'd like to have the option of going to a fresh water flush temporarily. If the raw water isn't dirty the commoderizers make the salt
water flush perfectly fine. We will continue to use salt
water as our primary option to conserve fresh water. We are capable of producing our own fresh water, but we still try to conserve when possible.
I would like to solicit ideas about a good setup. On the fresh water side we have seen conversions with solenoid and anti syphon valves, with the solenoid wired in to the electric
head's dedicated (salt water) pump
. We will likely include check valves as a backup to the all-in-one solenoid and anti-syphon valves as extra protection for our fresh water supply. A conversion from salt to fresh water flush seems relatively straight forward but there are a couple of questions that arise if we want to keep the salt water flush option available. Any advice
is welcomed and if my assumptions are wrong, let me know. I also know there's more than one way to do it, but I'm looking for a well-tested way.
1) We would "T" into the ship's fresh water supply under the sink in the head
the fresh water into and through the solenoid and anti-syphon valve, then into a ball valve.
2) On many conversions with electric heads, the salt water line into the head
is simply capped off. The solenoid is wired into the salt water pump
so that it's activated when the head is flushed. I assume I can place the ball valve between the pump
and head, route
the salt water line into the same ball valve mentioned above and that would allow us to switch between fresh water and salt water flush.
3) It seems that we need to keep our thru hull
open supplying salt water to the head's electric pump
so that it doesn't burn out. Since I've seen installations (on YouTube - Out Chasing Stars) that simply cap off the salt water line, a closed ball valve should work
4) My hope is that we can design a system, that once installed, with the turn of a couple of valves we can switch between water sources. Although we don't want to waste money
, we don't mind spending a couple of hundred dollars per head to make it right. We plan to live aboard for several years.