This prototype runs by a refrigerator timer motor and takes about 1 1/2 minutes for a complete revolution. I have noticed that rocks at low tide that are out of the water, but remain wet grow much more algae than rocks that stay submerged all the time. I am using that principal for this device to see if it grows more algae then my algae trough. It is lit with 18 LEDs that are about 1/2" from the belt which is cotton cloth on a plastic screen which is simple to remove. If it works ...
I am now the official authorized repair tech for all of North America for Teco so if you have any repairs or questions feel free to ask they will have a web page for me up shortly. I also repair all other brand chillers too!