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Had a septic tank in my house in Kent for over forty years, emptied once, house in France (now sold) only emptied once in twelve years and that was prior to the sale that the buyer insisted upon, tried to reason with them as you say, but most people are far too used to cess pits, not septic tanks with filter beds, one thing I would disagree with, septic tanks only smell if they are not sealed or vented correctly, not because they are not working at optimum efficiency, the action of a septic tank is anaerobic i.e. without oxygen, but the gases (mostly methane) above the scum line need to be vented and always smell, therefore the need to vent away from buildings.