Ok i am starting to understand this setup. So essentially there will be no water coming down the emergency lines? There are drip trays so will the single lines in each compartment still flow over all the media?
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The emergency drains could have a very slow trickle. You should also check it by closing both main drain valves and the two emergency drains should be able to handle the flow. As for the wet/dry, drip trays should distribute the water evenly thru the media on both sides.
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