Just a few pieces of bamboo jabbed into the bottom work for me, just be sure and not use the great big stuff. I tried to sink a big piece in deep water and invested 20 bricks into it before it would go down. I use the 6 to 8 ft. pieces and lean them over. Scatter them out and you have got plenty of places to catch slabs. I also use the bamboo for what I call spawning sticks. I take about a 2 ft. piece and jab it into the bank about 1 ft. under water slanted to the top. When they are spawning they will find and use these.