I've come across another of these, last one I fixed a leak in the aspirator tube with roofing sealant.
This one has a cracked cistern and the aspirator will not fit in the new cistern plus I think the seal is shagged. Now because these things use about 2 gallons of water they are no longer on the market. rather than attempt to find a replacement aspirator that fits does anyone know what the effect of simply closing off the aspirator vent to the second chamber would be?
Currently without the aspirator the level in the pan rises substantially and then the flush is not very good at removing the solids.
AJH