You will need 3, 5 gallon plastic buckets with only 2 lids. You will need a "plunger" type laundry tool, usually blue, with wooden handle, and some pvc pipe cut in 6" lengths and a T joint to affix a horizontal handle to the top of the wooden handle, with screw and bolt. You will also need a 1/4 " or 1/2 " plastic chopping board that is at least 11" by 14" to cut into a circle that fits the bottom of the buckets. And, a "garage" handle with screws to attach it to the circular chopping board.
The rinsing process echos the washing process until the nappies are clean enough to pick them up with hands and hang them out to dry.
This system can also be used for smaller loads of laundry like socks and underwear.
I made 210 nappies out of a used flannel, fitted king bed sheet ( purcashed at a thrift store) cut into 6" strips. I cut those strips into 6 or 12 or 18" pieces and then using my ordinary sewing machine, zigzaged the edges. Watching a movie or listening to a podcast during this task helped the time to whiz by. I have 104 stitched nappies and another 106 cut but not yet stitched stored in zip lock bags.