A few weeks ago, I started digging my pond to be. I hope to have it going by spring. I plan to build a scrubber out of a plastic "55 gal drum" (I've got some food grade ones that have been sitting around for years). I'll mount the spray bar through two holes drilled across the top of the drum. Next is cutting a couple of portholes through the sides to artificially light the screen on both sides. Water drops off the screen into a bed of lava rock and back into the pond. The top comes off easy for screen removal and cleaning. Assuming this is a reasonable thought experiment (it's still too tenuous to be called a "design"), how do I cut and drill the drum? A hole saw drill bit for the pipe mount?? A jigsaw for the portholes??? And lastly, how do I plumb the bottom to seal the round side the the barrel for the exhaust floe? Thanks.