Hence my original post concerning opaque water.
I have a bay-res reservoir, but it's dimensions don't fit the intended location very well, and there's the issue of the "filler cap possibly leaking (although that's easy to fix).
So, I was off looking for a different kind of reservoir. At first, I thought I'd try one of the 6-inch criticool waterplant reservoir, but my local electronics expert and I agree that the arc of the round reservoir would probably have some bizarre and unexpected effect on the IR light beam.
Right now, I'm considering making a custom reservoir that looks something like the drawing attached to this message.
The idea is that if I make a separate sensor trough, the water won't be as agitated as the water in the main reservoir bay, so the sensor readings will be more stable.
Also, I can probably reduce the intensity of the beam enough that it won't penetrate water that is mixed with some sort of semi-opaque substance.
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