Do you leave the disposal running all the time?
If you leave the disposal running for a length of time, depending on the size of the disposal you purchased, it will shut off after 30 – 45 minutes and you will have to push the reset......
Is there an on/off switch or do you just plug it in?
On the model that is pictured, we did not have an on/off switch; we just plugged it in when we needed it. On newer models we have made, ....
How does the mixture recirculate back into the cooler?
When the valve that allows the mixture to come out......
How long will the mixture last in the cooler?You will just have to use your own judgment on this. The number of guest will determine how much you will have to make
Obtain a suitable water cooler. Ours was 5 gallons, which is a bit big. Smaller would be better, but you do need room for the plumbing on the bottom.
Purchase a garbage disposal. We used 3/4 horsepower, I have had customers try ½ horsepower disposals and worked fine and others have told me that they used both and by far, the bigger was better.
Tools. Yikes, this may be difficult. You may be more of a carpenter than I am and more handy with tools than I am. So, I am sure there are other tools that will do what you need them to do but here is a list of what I used. You will need access to a drill press with a drum sander, a circle cutter, some large bar clamps, and a hacksaw. To make a stand either a table saw or radial arm saw. A circular saw could be used as well.
Misc. plumbing. A 1" PVC ball valve (shut off valve), four 90 degree elbows, one 45 degree elbow, a ‘T’ connection, a 1" to 3/4" reducing plug, about 4 feet of 1" PVC pipe, and pipe glue. A flexible coupling, made out of soft rubber with two hose clamps, is used to join the disposal outlet pipe to the remaining 1" PVC. We used RTV silicon intended for aquariums so it would be non-toxic to seal the inside pipes and glue down the cooler to the base. Use rigid PVC.
For the base – 1 sheet of 3/8" CDX plywood, about 20’ of 1" x 2" stock, two handles, and a roll of steel plumbers tape.
If you want an on/off switch, you will need a switch that will work with the disposal you bought. Also, you will need enough romex to be able to plug in the machine wherever you want to operate it. Check with someone before you buy the romex to make sure it is compatible (large enough) with the disposal you bought.