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Well as it pretty much all breaks down (without a macerator) and is a liquid when I dump it, I will calculate it at 1 ltr = 1 kg.

we can carry up to 100kg of crap in the black tank....
Then there is the lockers....

Weigh the polly waffles before flushing,, fit a weight sensor there seems to be everything else in those bogs.. I can just see it now, writing down the daily tally We used to use coffee filter sheeting for just such "jobbies" (in hospitals of course) I know, why not invent a dehydrating bogger?? or something along the lines of those sanitary thingy burners, just left with ashes then.. easily disposed of.

Already been done Dottie, the electrical power to run it would be way too much for even lithium batteries, here is the post I made on the CF about it, roughly 160Ah @ 12v per polly waffle

But how many and who's polly waffle's did you use for these figures

Took it from the unit specs, it's how long each cyl runs I think. Can you imagine the smell or toasted polly waffle till it was ash

Polly waffle crematorium for hire

T1 Terry wrote:Took it from the unit specs, it's how long each cyl runs I think. Can you imagine the smell or toasted polly waffle till it was ash

Hopefully you will never have know how much suspended solids smell while the are being dry roasted.(That's the technical term for black water with the liquid removed) I do unfortunately. I get the job of fixing the exhaust fan system at the treatment plant laboratory when it fails to function correctly. It all turns to powder when it is dried completely.
I will find out exactly how much the average litre of black water weighs as soon as the Process Engineers get back from holidays.

Knew there would be an answetr out there await with interest

Well I'm going to go out on a limb here and say it is close enough to a kg.