Before I spend even more time, skin and money trying to re-invent the wheel. Or in this case the poo-pump.Maybe somebody here has solved the problem.
I have a LAVAC loo whith the traditional HENDERSON manual pump. It seems that this does not satisfy the local macerating standards.
A friend on a multi successfully simply installed a 12v macerating pump in place of the HENDERSON. On my mono with the loo well below the water line this was a dismal failure as the 12v pump does not have enough suction to draw in clean sea water.
Has anybody tried to install both pumps in line?
Any other suggestions?