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Looks like a very large bead filter to me. It looks like it has 4" lines running in and out of it. I think about 6' tall as well. They also say ro-1 and ro-2 on them so maybe they do some water softening or conditioning as well?? I don't think the bio chamber is as large as the pond. I think its just labeled 150 ton so you know which bio chamber the pond is for in the diagram. Notice the 70 ton bio chamber is right above it.
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