Sea toilet to cassette

colind3782

colind3782

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As there is nothing original in this world I would bet that someone has already done what I’m trying to achieve.

At present I have a perfectly good electric macerator sea toilet which I’d like to keep but no holding tank, a requirement in Spanish waters. I have considered a porta potti but I would rather keep the existing toilet. I was wondering if there is a way of fitting a cassette type tank which can be taken out and emptied in the usual way?

I’m in Spain at the moment and I plan to speak to Tek Tanks on Monday but has anyone done this before?
 
I thought that you had to provide a tank of a particular size e.g. 4 litres a day for each berth for 4 days so a four berther had to have a 64ltr holding tank.

Look at the RYA website - I expect the regs are there.
 
MoodySabre said:
I thought that you had to provide a tank of a particular size e.g. 4 litres a day for each berth for 4 days so a four berther had to have a 64ltr holding tank.

Look at the RYA website - I expect the regs are there.
Click to expand...

Not convinced about that one. My boat is on the SSR but lives in Spain. All the locals use porta pottis but I'd rather keep the existing toilet.
 
I posted a thread recently on replacing the sea toilet with a Porta Potti, it might be worth a read (here). Also recent threads about composting loos might be worth a look. Personally I don't see the point of fitting holding tanks when there's nowhere to empty/pump them out and you can tick the "Do you have a holding tank?" box with a Porta Potti/cassette loo...
 
'Cassette' type chemical loos are usually accessed from the outside of a caravan; tricky to sort & keep the large aperture hatch watertight, low down on a boat !

I have always used a standard 'Potra Potti' on my 22' boat, no problems, and no holes in the hull.

Modern chemical loos don't smell; if finding one that does, it almost certainly means the seals have gone.

Thetford do offer seal replacement kits, but personally I just replace the loo every 10 years or so.

Chemical loos come with their own 'holding tank', with a guage to tell when near full, which can be carried to shoreside loos to empty - if well offshore it goes over the side.

The chemicals are now 'green' both literally & in not being toxic to surroundings like earlier stuff.

NB chemical loos still work if the boat is dried out on her mooring or alongside a wall etc, and can be used in busy marinas without the embarassment / rule breaking of pumping out.
 
Last edited:
Shug,

for a start that looks quite high; on small boats headroom in the loo is a major consideration, if choosing a 'Porta Potti' model that's probably the main thing to check, along with weight of the holding tank if having to carry it ashore or even to the cockpit coaming...
 
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