Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 19-05-2017, 10:24   #1
Registered User

Join Date: Oct 2015
Location: Sydney/Croatia
Boat: Lagoon 450
Posts: 46
Dumb toilet ("head") question

Showing my rank amateur status etc.etc. I was wondering why you can't "adapt" a house cistern to your head. Mine is a catamaran so while it moves and yaws and rolls a bit, it's not a big heeler. So why wouldn't a small house cistern fitted above the intake pump (in my case in one of the over-sink cupboards) and adjusted down in capacity by lowering the float work?. Feed the pressurised water into the inlet (just like a house fitting) so that the "float" turns it on when needed and off when full (as I say I would imagine setting the float low so full is not really overflow style full). Silicone the standard outlet (the one that lifts when you press the flush button on the cistern so it is closed) and pipe the "overflow" to the sink waste pipe. Then drill a new outlet into the bottom of the cistern and attach that to the inlet of the pump for the toilet. You press the flush button (electric toilet) the pump draws water from the cistern. The pump stops, the float opens the inlet and refills the cistern.
I know I must be missing something? Is it just the rock of the boat making it hard to set the float? Or is it something else. If this idea is too ridiculous for words then I stand in the dunces corner.
__________________

__________________
Blackduck is offline   Reply With Quote
Old 19-05-2017, 14:44   #2
Registered User

Join Date: Aug 2009
Location: Lake Macquarie NSW
Boat: Chamberlin 11.6 catamaran
Posts: 163
Re: Dumb toilet ("head") question

No ideas is ever ridiculous and some ridiculous ideas find their way back in favour - foils took 50 years to be viable in multihulls (Search Dave Kieper and Wiiliwaw if you want a trip down multi history)

Most boat toilets are below the waterline and need pumping UP to get the waste out of the toilet. As normal toilets are gravity fed they can't work in this way. On my cat the top of the toilet is 100m above the waterline (it helps not sink the boat) but I still couldn't use a normal dunny.

If you decided to put the toilet on the bridgedeck then go ahead. It will work especially well if you plumb it straight down. I have heard of Hitchiker 40 with this arrangement. You could even plumb it into a holding tank that was also above the waterline so you could discharge easily when sailing. (That is what we do when cruising - holding tank on when anchored, discharge at sea when 5-10 miles away from anywhere doing 6 knots or more with a gravity discharge tank).

So if you have a space in the bridgedeck then go for it but there are few cats with bathroom soles high enough for it to work.

cheers

Phil
__________________

__________________
catsketcher is offline   Reply With Quote
Old 19-05-2017, 14:50   #3
Senior Cruiser
 
StuM's Avatar

Cruisers Forum Supporter

Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43
Posts: 6,439
Re: Dumb toilet ("head") question

May be OK if it's fresh water flush and you've got enough fresh water storage. Personally, I'll stick with sea water flushing. And I wouldn't want sea water sitting in a cistern for too long. It can get a bit funky once the microscopic organisms start to die off

The other thing to worry about is back-contamination if your head/cistern are plumbed into your fresh water supply in any way and things get stirred up by boat motion.
__________________
StuM is offline   Reply With Quote
Old 19-05-2017, 14:51   #4
Senior Cruiser
 
StuM's Avatar

Cruisers Forum Supporter

Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43
Posts: 6,439
Re: Dumb toilet ("head") question

Quote:
Originally Posted by catsketcher View Post
On my cat the top of the toilet is 100m above the waterline (it helps not sink the boat) but I still couldn't use a normal dunny.
Do you have to climb the mast to take a dump?
__________________
StuM is offline   Reply With Quote
Old 19-05-2017, 15:14   #5
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 7,285
Images: 69
Re: Dumb toilet ("head") question

That's a long drop!
__________________
"You CANNOT be serious!"


John McEnroe
44'cruisingcat is offline   Reply With Quote
Old 19-05-2017, 15:46   #6
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 7,285
Images: 69
Re: Dumb toilet ("head") question

Quote:
Originally Posted by Blackduck View Post
Showing my rank amateur status etc.etc. I was wondering why you can't "adapt" a house cistern to your head. Mine is a catamaran so while it moves and yaws and rolls a bit, it's not a big heeler. So why wouldn't a small house cistern fitted above the intake pump (in my case in one of the over-sink cupboards) and adjusted down in capacity by lowering the float work?. Feed the pressurised water into the inlet (just like a house fitting) so that the "float" turns it on when needed and off when full (as I say I would imagine setting the float low so full is not really overflow style full). Silicone the standard outlet (the one that lifts when you press the flush button on the cistern so it is closed) and pipe the "overflow" to the sink waste pipe. Then drill a new outlet into the bottom of the cistern and attach that to the inlet of the pump for the toilet. You press the flush button (electric toilet) the pump draws water from the cistern. The pump stops, the float opens the inlet and refills the cistern.
I know I must be missing something? Is it just the rock of the boat making it hard to set the float? Or is it something else. If this idea is too ridiculous for words then I stand in the dunces corner.
Should work, but you'd need to make sure the cistern lid was watertight, so that sloshing around doesn't leak.

I'd also suggest a non return valve between the toilet and cistern, you can't have too much backflow prevention in this area.
__________________
44'cruisingcat is offline   Reply With Quote
Old 20-05-2017, 00:24   #7
Registered User

Join Date: Oct 2015
Location: Sydney/Croatia
Boat: Lagoon 450
Posts: 46
Re: Dumb toilet ("head") question

Thank you for your thoughts. I will continue to investigate. What I am intending this "house cistern" to serve as is simply an automatic fresh water reservoir with an air gap (and yes I would add non return valves) to change the toilets from salt to fresh water. So it wouldn't work the way it does in a home using gravity, the pump for the head would still do all the work.
__________________
Blackduck is offline   Reply With Quote
Old 20-05-2017, 00:37   #8
Registered User

Join Date: Mar 2010
Location: Alaska
Boat: Truant Triad 37 Cutter
Posts: 337
Re: Dumb toilet ("head") question

Interesting idea. For our boat, it would be a great thing but not for the toilet. We could use a fresh water gravity fed tank to supply the sinks, or even to fill small jugs or have a spigot into our filter tank.
__________________
seahag is offline   Reply With Quote
Old 20-05-2017, 03:19   #9
Senior Cruiser
 
StuM's Avatar

Cruisers Forum Supporter

Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43
Posts: 6,439
Re: Dumb toilet ("head") question

Why do you want fresh water flush? How much water do you store and how do you replenish it?
__________________
StuM is offline   Reply With Quote
Old 20-05-2017, 03:21   #10
Registered User

Join Date: Oct 2015
Location: Sydney/Croatia
Boat: Lagoon 450
Posts: 46
Re: Dumb toilet ("head") question

I am looking to go fresh to avoid the odour associated with salt water flushing
__________________
Blackduck is offline   Reply With Quote
Old 20-05-2017, 03:45   #11
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 7,285
Images: 69
Re: Dumb toilet ("head") question

Another thought. You'd need to mount the cistern so it's about the same height as the toilet, otherwise water from it will just run down into the toilet, probably overflowing it. Or install a shutoff valve between toilet and cistern, which you'd only open when flushing.
__________________
"You CANNOT be serious!"


John McEnroe
44'cruisingcat is offline   Reply With Quote
Old 20-05-2017, 03:59   #12
Senior Cruiser
 
Kenomac's Avatar

Cruisers Forum Supporter

Join Date: Jan 2012
Location: Somewhere in the Adriatic Sea
Boat: Oyster 53 Cutter
Posts: 8,122
Re: Dumb toilet ("head") question

Quote:
Originally Posted by Blackduck View Post
I am looking to go fresh to avoid the odour associated with salt water flushing
If your boat is here in the Adriatic, you won't detect any odor from the salt water.

In Southern California the ocean water stunk, mainly due to harbor pollution in LA harbor and the red tide plankton blooms, so changing over to fresh water was always on our list to do. But over here in the Med, we've never experienced the issue. You'd never even guess the water is salt water being flushed through the heads... clear and odorless.

Save you money for another project.
__________________
Kenomac is offline   Reply With Quote
Old 20-05-2017, 04:35   #13
Registered User

Join Date: Oct 2015
Location: Sydney/Croatia
Boat: Lagoon 450
Posts: 46
Re: Dumb toilet ("head") question

In fact it was purely an idea based on hearsay: of salt water odour. ( add to that and the fact I have been in a river for winter I haven't yet smelled it. But wanted the best I could in advance. So good advice I shall hold off.
__________________
Blackduck is offline   Reply With Quote
Old 20-05-2017, 04:41   #14
Senior Cruiser
 
Kenomac's Avatar

Cruisers Forum Supporter

Join Date: Jan 2012
Location: Somewhere in the Adriatic Sea
Boat: Oyster 53 Cutter
Posts: 8,122
Re: Dumb toilet ("head") question

Where are you located? I'm also up an estuary here in Italy.
__________________
Kenomac is offline   Reply With Quote
Old 20-05-2017, 08:32   #15
Registered User

Join Date: Aug 2009
Location: Switzerland
Boat: Outbound 46 -Callisto
Posts: 143
Re: Dumb toilet ("head") question

The only time there is odor with salt-water flushing is if the head hasn't been used for several days. The plankton in the seawater dies for lack of oxygen, and releases all kinds of smelly gasses. If you are using your head every day (ie cruising), no reason at all for any odor.
__________________

__________________
DMCantor is offline   Reply With Quote
Reply

Tags
head, oil

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
C-Head, Natures Head or Air Head- which is best overall Ram Plumbing Systems and Fixtures 48 24-05-2015 06:25
are "dumb" questions dumb, or ... sailorboy1 Our Community 27 20-11-2013 06:53
"recent price reduction""owner anxious""bring all offers" sailorboy1 Dollars & Cents 10 22-01-2009 11:25
A simple, dumb question. Gator81 Multihull Sailboats 2 23-01-2007 12:58
Dumb Question maybe kcrompton General Sailing Forum 4 29-12-2004 12:52


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:50.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.