I have my own mini sewage farm down the side of my house comprising a little concrete sarcophagus 45cm x 25 X 35 deep, divided into two chambers by a 25mm thick brique cloison. (Probably a 1965 “Grease Trap” that has been functioning well for at least the last 15 years). I had a malfunction caused by the build-up of “undesirable” materials blocking the outflow from the second chamber to the village sewer. I reckon that it was probably because it had not been mostly “digested” in the first chamber, the partition having (suddenly) broken up.
The brique is easily replaced. However, there is not enough of the original left for me to work out what had been the size and the position of the opening that would be below the waterline – probably crucial to the efficiency of whole process. Can any kind soul out there point me to the website that I just cannot find, or furnish me themselves with some advice? I would be most grateful.