Re: Not on mains drainage? Thanks for those.
Ours isn't very deep - a metre or so - and seems to cope well with all the liquid waste as it hasn't overflowed in the 10 months we have lived here. The solid stuff tends to collect on the surface and we are worried that over time it will fill up and then cause a problem.
The house is quite old (judging by the wiring, plumbing etc) and the previous owners had sealed up the hole completely. Don't know if they had 'paper bins' in their loos but we don't want those if at all possible!!
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