Depends on locality as many of the one family homes require I install sewer mains from 4" - 6".
The size of the "sewer" is based on fixtures units that are connected and to local codes
You must first connect a 1/2 inch PVC pipe to the outlet for the regeneration fitting on the softner and run this pipe outside and trench to the sewer drain and tie into sewer drain. The sewer drain will then flow the brine regenerater fluid to the septic tank.
If you are talking about a roof water drain pipe to sewer it is illegal. If you are talking about a sink drain pipe well that is where they all connect to so yea.
1/8th per inch
1-foot section of pipe contained 0.6528 gallons of water. 1/4 inch per foot but standard would be 1/8" per foot sewer line necessary in a house. alliedallcityinc.com
The standard diameter of an inch and a quarter copper pipe is 1.25 inches.
.25 per inch per foot
A washing machine drain pipe diagram illustrates how water from the washing machine is carried away from the machine through a pipe to a drainage system or sewer.
The building code where I live requires a drain pipe to slope approximately 1/4 inch per foot (+ or - 1/8 inch). The recommended pitch for a 50 foot drain would be 12-1/2 inches.
I would use 3 inch for that.
1/8" per foot.
The standard kitchen sink drain pipe size is 1 1/2 inches in diameter.
Yes. A reduction fitting can be used.