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The system has two things to deal with: liquids and solids. The latter means maintenance-free is bullshit.
One of my colleagues had a house with an anaerobic digestion system under the lawn. The liquid overflow was routed into a perforated pipe under the hedge lining the (slightly downhill) driveway, which was hence permanently "watered" and fertilised. The bacteria digesting the waste produced a flammable gas which was captured in a tank for his heating system. Even with the bacteria breaking stuff down, he still had to get the solids emptied occasionally, but a local farmer did this for free, since the remaining solids were reasonably sterile and nitrogen-rich.
Emyr
Cheers buddy.
It's a brand new place so not concerned re: the quality as it will be guaranteed for 10 years anyway.
Question is use and maintenance required. I've asked about specific system but the estate agent was adamant it didn't need emptying but trusting estate agents isn't top of my list.