How big is the tank, limetree?
Lots of the old toilet tanks in Kalkan were very small, and did have to be emptied every two or three days.
If you''re in a new house, I''d have thought they''d have made the tank a bit bigger, but you never know..
Also, are you sure that only your house''s waste is going into it? It''s not absolutely unknown for one property''s wastes to be going into a neighbour''s toilet tank, particularly in the old bit of the town.