Quote:
Originally Posted by karimwassef
18 inches. You don't need more than 3-4" for the calm bottom zone and likewise for the top 2". The rest is the 6-8" for the mid-zone. I have another 6" to the top with a sensor 2" from the rim and the emergency overflow 1" from the rim.
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Is that the water depth, 18", or the tub depth?
I'm sure your system works well, but, I don't see how the water at the lower 3-4" would not be circulating at a rate equal to the top & middle layers which both have outlets forcing water in the same direction in a tub of 18" max depth?
Is this stillness important in the process? I imagine the sediment on the bottom would compact somewhat.
Do you remove any sediment at all, ever?
I can understand that there would some tapering off of light reaching the bottom layer with the algae growing on the surface blocking a great deal & algae particles drifting around the entire water column filtering more light.
Is a low light level at the bottom-sediment layer important?