When I moved into this house the septic tank was two steps out the back door. I didn't like it right there in my face and also I didn't like paying the Thai man to suck it out every couple months. So I decided to do my own tank and leach bed. This is for a three member family. I know some of you have maybe four toilets in your house, but it doesn't matter how many toilets, it matters how many people in your family. Also only the toilet water goes to the leach bed, sink and shower drains go to a separate French drain. I did some reading and it said you should have a minimum of 60 feet of leach bed, but I doubt if they were digging theirs by hand so I went with 50 feet. I figured if its not enough and I have problems, its no problem to dig it up, cut the cap off and extend it, its been a year and a half with no problems. The tank is a #1200. I couldn't find the perforated PVC that I wanted so I made my own. Starts with digging a big ass hole, try to get it right the first time because it really sucks dragging that tank up out of the hole. I had some Thai help but they didn't amount to much, they scratch around a little bit and then flop down to watch. The trench is 24 inches deep with 6 inches of stone in the bottom, lay the PVC and more stone flush to the top. Cover with the black cloth and backfill, done.