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Hi Remi, this appears to be the Sato pan developed by American standards and being manufactured in Bangladesh. Where this is being sold directly into the market there it appears to be enjoying good acceptance due to its low cost, ease of transport and the fact that it requires only 100ml of water to flush. The flap retains a small amount of water to help retain the seal so it actually remain a water seal, but the flap system simply allows this to be significantly less than even a low flush water seal option.

WaterAid in Bangladesh is using these in a trial period through a targeted approach, i.e. for more vulnerable households. Initial user feedback is good, but the real test will be time.