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Personally I do not like the bio-falls box. Never have used one. I have seen too many ponds where it is obvious there is a box with stone stacked or piled around it.
I have done what others have mentioned and created a bog for a biofilter. I find this to work better because you can plant several aquatic plants in it which makes a nice back drop.
Or I have just hidden the outlet pipe in a creative manner at the top part of the water fall. Just need to be creative. I have found this looks more "natural" than the expensive plastic box.
A couple of times I have drilled a hole thru a rock for the pipe outlet.
Mike
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