Ducky, glad to hear that your dad is doing better. Sucks that we
only get to keep them for so long, so fwiw spend every bit of
time you can with them.
I've also got a Super Sluice, and as said it's a real pig of a pan.
I use it to get rid of all the blond material when I'm out sampling
areas of beach sand, and then bring the black sand only home
to process further.
Trick with it is to work it underwater, and let the buoyancy of
the pan in the water do a lot of the "holding up" work. Using it
right you can really work through a bucket of material in a short
time, saving the heavies to another container. It stinks as a finishing
pan, however...the way the bottom is designed I just can't get the
water to move right.