Im hoping i can post a picture of a 6" pvc sluice i built, i wanted something light and able to run with an electric bilge pump. Well after field trails im very happy, the pump is 1000glh and uses 3 amps.the battry is a 32amp gel which is more than needed. A little heavy and i would think a 20 amp bat would be better with out killing it in 4 hours use. I went narrow with the sluice so the water flow is enough, and i found Wals metal clasifier reduces the matieral a lot. Iv usedd a bread crate and moss. But im sold on a bit of ribbed rubber matting i saw on another sluice which the guy found very effective at stopping the gold. At 1.5 meters long i can carry it on my back with a strap. Sorry for mistakes cant edit on this phone, hope to have a ipad tomorrow and then i will be posting lots about Nundle which im finding is a great place to look. There is also gem stones here as well, iv found a bright ziconia already and the other fossickers here have a nice parsel of of stones and fossils.