Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 10-05-2010, 17:50   #16
CF Adviser
Intentional Drifter's Avatar

Cruisers Forum Supporter

Join Date: Apr 2006
Location: Pac NW
Boat: Boatless, for now, Cat enthusiast
Posts: 1,269
Been there -- tried all that. The muriatic acid will take out the scale, but depending on your hose, you could also damage it if you leave it in too long. Also, it won't get the stink out of the hose, which permeates all the way into the hose.

Regular vinegar treatment works well to keep the deposits from forming in the first place, but won't touch it once there.

Easier to just replace the hose. While it costs more, using a better quality hose will help keep the stink down, longer. The "Green Stripe" stuff is a better quality while not outrageously priced.

Just another one of the joys of boat ownership. Hopefully, your hoses are run such that you can get to them easily.


Intentional Drifter

Observations are gold; hypotheses, silver; and conclusions, bronze.

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote.--Ben Franklin

Everyone is entitled to their own opinion, but not their own facts.--Daniel Patrick Moynihan
Intentional Drifter is offline   Reply With Quote
Old 15-05-2010, 15:06   #17
Registered User

Join Date: May 2010
Location: Long Beach CA
Boat: 34' Aloha sloop, S/V Ishi (deceased)
Posts: 44
Lightbulb The Only Solution to discharge hose deposits

We too encountered the common problem of the buildup of deposits in the head discharge line. Despite trying all of the already mentioned "tricks" to solve the problem, we found that they were only partially effective. We still had to remove the discharge hose about once a year and "pound" it to dislodge the accumulated deposits. This is typically a difficult and messy project. I'd much rather spend the time sipping rum in the shade.

After about eight years of using the above-mentioned old "tried and true" techniques, we finally discovered the only way to avoid the problem, and it's deceptively simple. Here it is:

FLUSH YOUR HEAD MORE! The problem is caused by residual waste matter, especially urine, which remains in the hose after inadequate flushing. Urea and other dissolved matter tends to precipitate out and become deposited on the hose walls. Very few cruisers actually flush their heads enough. I guess the reason for this is something like "out of sight, out of mind."

We put a few pieces of toilet tissue in the bowl and then began flushing it, while watching at the thruhull location to determine when the tissue paper was expelled. We counted the strokes required for this. Then we added about 50% more strokes for good measure. This solved the problem for good, and we went for the last five years without having any problem with deposit buildup in our discharge hose.

This technique worked for our manual head with a direct discharge to the sea. I don't know how well it would work with some of the more modern, complicated heads. Also, if you are having to discharge into a holding tank, this technique will rapidly fill your holding tank, requiring much more frequent trips to a pump-out station.

On the other hand, if your situation is like ours was, where we were usually anchored off in foreign countries, where direct discharge is practical, the technique works well. I'll leave it up to you: either flush little and expect to be cleaning out your discharge hose more often than you'd like, or flush a lot and never have to worry about the problem again!

ishipaco is offline   Reply With Quote
Old 15-05-2010, 15:23   #18
Senior Cruiser
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
Yeah, a lot of it is the urine not so much the sea water. If it was just sea water, your galley outlet would clock at the same frequency as the head. You need to pump it more to clear it all out, which of course causes the holding tank to fill up more.

We're at about 3 years between removal / replacement of hoses. It's not really that hard once you get the hang of it. I don't bother trying to re-use hoses. I keep a bunch of spare onboard, and fashion new pieces. That way when removing I can just saw the old ones off their fittings and speed up that part of the job.

I push vinegar through as well. If you leave vinegar in your lines for a few hours and then discharge overboard, you'll be amazed at all the gunk and goo the vinegar has managed to discharge.

We keep a spray bottle of white vinegar in the head. Some spritzes in the bowl is always welcome.
rebel heart is offline   Reply With Quote
Old 16-05-2010, 04:21   #19
Registered User

Join Date: Mar 2009
Location: Australia, Central Coast.
Boat: Boden 36 Triple chine long keel steel, named Nekeyah
Posts: 689
We had a hotel for years, and the gunk that used to build up in the latrine drain was almost like limestone. We used to pour dilute hydrochloric acid as used by brick cleaners down the drain and let it sit. Used it straight out of the bottle. You can buy it at any hardware store. Worked well and took the smell away too but the fumes are pretty fierce.
Regards, Richard.
boden36 is offline   Reply With Quote
Old 16-05-2010, 05:04   #20
Moderator Emeritus
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 29,364
Images: 240
Originally Posted by boden36 View Post
... We used to pour dilute hydrochloric acid as used by brick cleaners down the drain and let it sit. Used it straight out of the bottle...
... but the fumes are pretty fierce.
Regards, Richard.
Be careful.
Hydrochloric acid (± 31.45% HCl) is often sold as “Muriatic” acid.
Chlorine gas is produced when mixing hydrochloric acid with common oxidizing chemicals, such as sodium hypochlorite (bleach, NaClO) or potassium permanganate (KMnO4).
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

GordMay is offline   Reply With Quote
Old 16-05-2010, 08:52   #21
Registered User

Join Date: Oct 2006
Location: Nanaimo, BC
Boat: C&C 41
Posts: 314
Thanks to all for your insights. I am going to replace the hose.
Rex Delay is offline   Reply With Quote
Old 16-05-2010, 09:12   #22
Pete7's Avatar

Cruisers Forum Supporter

Join Date: Aug 2009
Location: Solent, England
Boat: Moody 31
Posts: 6,714
Images: 14
Originally Posted by Rex Delay View Post
Thanks to all for your insights. I am going to replace the hose.
Good plan. We did ours last year when it blocked half way through our holiday

The new hose was $50 for 5m, it just wasn't worth faffing around with the old stuff which had 1.4" of scale inside. We did the jabsco pump at the same time, huge difference to the old pump.

Pete7 is offline   Reply With Quote
Old 16-05-2010, 09:19   #23
Registered User
rover88's Avatar

Join Date: Nov 2008
Location: Panhandle of Florida USA
Boat: Bristol 34
Posts: 328
Images: 4
It cost me about $80 annually to replace my head's hoses. I figure it would cost more to be constantly pouring chemicals down the toilet (figuratively and literally). As far as I am concerned this is money well spent to keep the Skipper from complaining of the odor and me from having handle nasty poo-poo hoses more than once a year.
rover88 is offline   Reply With Quote
Old 16-05-2010, 16:41   #24
Registered User

Join Date: Oct 2009
Location: CLOD in OH
Posts: 257
Mark Zarley is offline   Reply With Quote
Old 18-05-2010, 20:13   #25
Senior Cruiser
osirissail's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: A real life Zombie from FL
Boat: Gulfstar 53 - Osiris
Posts: 5,416
Images: 2
Human urine plus sea water makes the scale that is as hard as fired enamel. There is little you can do to remove it non-violently. You can slow it down with vinegar. You do not get the build up if you use fresh water to flush but that requires a rather large potable water storage/replenishment system.
- - The scale buildup is just one of many "prices" we pay for living on the water. Normally it takes years for the stuff to seal off a hose and then you merely remove the old hose and put in a new piece so make sure you can access the area where the hose is located.

osirissail is offline   Reply With Quote

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
Scaling / Drawing Charts Netsurfer OpenCPN 1 05-02-2010 11:03
Scaling w/ Various Intake Hoses thinwater Plumbing Systems and Fixtures 3 22-05-2009 08:11
Waste Oil Heater for a boat Chief Engineer Plumbing Systems and Fixtures 1 17-10-2008 09:53
Waste Placard? Kriscappiello Off Topic Forum 17 25-08-2008 13:40
Oily Waste Management markpj23 Engines and Propulsion Systems 13 04-06-2007 12:37

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 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 12:10.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.