Response to how do you build a grease trap in a grey water line?

I would check with a septic contractor. You can still buy those concrete grease traps. In fact, in Texas many places require them, including the Farm Home Administration. I suspect they are available where you live. If you didn't want to buy one, you could probably make one from a plastic barrel. HOWEVER, I have lived in the country for 40+ years, in some 14 or so different houses. There was only one house with a grease trap. The land lady said the house had been in their family for 50 years, and she didn't remember anyone ever cleaning the grease trap. The drain worked just fine. Everywhere else the entire kitchen sink flow drained out into the pasture, except at one house we owned. My former husband and his brother installed the pipe about 6 feet below ground, with the end of the 4" perforated sewer pipe emerging about 110' from the house. We kept a tin can over the end. We never had a problem with that drain in the 6 years I lived there after the installation.

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