Gray water versus Holding.... Whaaaat?
Typically the DWV (drain,waste, vent) system for a sink are 1 1/4" to 1 1/2". Most inlets/outlets on Grey water tanks are 1 1/2" to 2".
Sloped bottom tanks may flush more efficiently but only if the outlet is large. One must keep in mind the size of the vent as well. It must be large enough for free air flow into the tank as the waste is discharged. Otherwise you may get gurgling. Fill a plastic jug with water. Turn it upside down and it will gurgle. Turn it at an angle it will flow steady.
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