I had an idea one day about making a cylinder UAS. And so this is my work in progress that I have been testing.
I attached a plastic screen to a 4" to 3" PVC reducer. I then found a glass cylinder that was 10.5 inches tall. It fits perfectly in the 3 inch section of the PVC reducer. The light hangs down into the glass tube and shines onto the inside of the algae screen. The glass cylinder has a bottom so no water can get into the cylinder. I put an airstone under the 4 inch section and drilled holes around the edge of the pvc outside and inside. The air bubbles flood up along the outside and inside of the screen. To capture the bubbles so they do not go all over the sump I currently have a plexiglass cylinder around the outside of the screen. The bubbles rise up and are released around the top edge. These bubbles pull in water to the screen. Not sure if I am going to keep the plexiglass cylinder on the outside. I really liked my original idea of the screen just sitting directly in the water with nothing around it. This, in my opinion, would allow the more water to flow across the screen.
I would like your opinions or ideas and I will post more pictures as I continue to modify my design
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