Correct. Urine does nothing except fertilise the seaweed. You're pouring salty water into salty water.

I've placed my order, as follows:

Kildwick Kompact Urine Separator × 1 £45.00

Eco-Loo 'Quiet' Fan Kit - 12v × 1 £20.00

20 litre Solid Waste Container × 1 £8.95

12 Litre Urine Container - translucent × 1 £34.00

BioBag 25 litre Compostable Bag - Roll of 25 × 1 £8.49

Eco Urinal Blocks - Pack of 10 × 1 £7.00

Subtotal: £123.44

( to this must be added a standard household toilet seat in solid wood)

I reckon I can make a much more compact arrangement by building in an enclosure as part of the boat, rather than trying to fit in any of the proprietary fully-built units. My problem is headroom, and this seems to be quite a good solution, as the urine container is low (but quite large). I have plenty of room fore and aft, and that's good, because I will need a container of composting medium readily available.   

David Tyler wrote:

I was thinking that I'd have to get a C-Head sent over from the USA - and then I did a bit more research and found that there's now a UK firm that will supply all the necessary parts for a DIY composting head:

http://www.littlehouse.co/

Hi David, we bought an AirHead from Littlehouse, very good service and a very good loo (it's been working as the workshop loo since 2013 with no smells or other problems)

Annie Hill wrote:That looks interesting Thierry.  Do you think the fact that it won't be sealed will be a problem?  I assume you'll be building some sort of bulkhead arrangement around it to stop it falling over.

I am not intending to use it offshore or sailing, just in places where I need to hold for later disposal. Our standard toilet will remain a bucket. That has worked faultlessly for years.
The snap lid is there to seal it when moving it. In fact I don't think I will use the Lavac cover, just the ring to be comfortably seated. But yes I will somehow stop it from moving about!

We have an outhouse here at home with a sawdust bucket and even with no separation it doesn't stink as long the deposit is covered so I don't expect the poop alone to stink once covered. The big advantage with the separation is that the weight is greatly reduced.

Cheers

Thierry

I was assembling the housing for the toilet, my wife came along, had a quick look and said: you could just have a container inside the bucket and you don't need a tank.
Of course she was right so I decided to change the concept and save myself hours of work. Why make it complicated when it can be so simple?
This is what I made:
https://picasaweb.google.com/thierry.msika/SeparatingToiletForIo?authuser=0&authkey=Gv1sRgCM72i5mG563cywE&feat=directlink
I had all the parts lying around: Lavac toilet I found and never installed, bucket and mixing bowl.
I think it will work. We will be testing it in the next few days.
I'll let you know how it goes.

Cheers

Thierry