Pozo negro

do you have a digester outside or inside your property ? or is it a bio tank in the garden

hopefully thats not me talking manure again (:

i once installed a bio tank , it wasnt just a case of digging a hole and plonking it in ..dig hole with exevator and lay 40-50 mil concrete 5-6 inch in normal measures , then lower tank in..surround tank with sand , then back fill , not forgetting the inlet pipe needs to be joined and the vent pipe exposed ..n.b. all mesauements are appox and not true..before some remainer comes on and says lol

make sure you have at least 6 inch sand surrounding the tank , it needs to move

Thanks for speedy reply.

The deposit tank is approx 10 metres from property. I have no idea what its construction is and neither does the agent or neighbour know. It is old could be 50yrs old so I will have to research how the Spanish used to build them. Thanks again for your comment.