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I'm not sure how they do it, but the tubing size used wouldn't matter so long as they included its resistance to the measured vertical lift for the test. Determining the max lift is easy, as the tubing size doesn't matter at all
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Shaft, That would work out if they measured in PSI would'nt it?, but in feet?, the weight of water would be different would'nt it?...
PS. how much is a Ehiem1250 in Cad$?...