Thanks for all the detailed instructions! I am curious - what is the function of the strainer on the bottom of the can? Is it to keep the muzzle up off the crud on the bottom?
Mostly to allow water to flow in and out without restriction (i.e. so the bottom of the can does not act as a stopper against the muzzle). One of those plastic "brillo like" scrubbers works well also. The plastic coffee can is a good suggestion. I avoid metal cans also. Other alternatives are plastic bleach jugs or laundry detergent jugs with the tops cut off.