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I had a down draft and now have a NW. The NW is set and forget. Clean the collection cups twice a week. I've disassembled the pump twice in 1.5 years for cleaning. Otherwise haven't touched it. The DD was more finicky for me, alot more fine tuning and not as much waste. (probably not a good comparison on my part because the 2 skimmer are in a different class). Also I gravity feed mine so there is less power consumtion. I will only go with NW skimmers from now on.
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