Well that's not such a pleasant experience so we decided to make some fake poo. The Environmental Protection Agency of America say to use the Maximum Performance (MaP) Testing Toilet Fixture Performance Testing Protocol. Basically this involves getting some soya paste (not so easy in Uganda), extruding a 10cm x 2.5cm cylinder of it and covering it with a condom. The only soya paste we could find was pretty runny (not a healthy poo) so we mixed it with some kaolin clay to make a firmer stool and popped it in some condoms - not sure why George insisted they needed to be black and ribbed though.
You then pop these in to the pan and U-bend you're testing. Chuck 2 litres of water down it and see if the little darlings pop out the other end.
We found a pan and ceramic U-bend that works well with 2 litres of water available on the Ugandan market.
We're currently adapting IDE.org's chamber box from their easy latrine to take this pan.
Richard will then work with entrepreneurs to sell standardised flushing systems to households and masons. This will also form an integral part of the Dura-San modular latrine so households can have the option of employing a mason to build a brick structure or a Dura-San structure.
The entire structure will look something like this.