No Wes. No markings at all. Funny though as I had a nac 7 prior and liked that feature.
The manual states 1 full turn after break in for fine tuning. (on venturi)
Yes the venturi will/shouldincrease or decrease air
When I set this skimmer up and priors. I put the stand pipe in the middle and find a height it works good at. Then I can adjust up or down for best skimmate.
Im notsaying this is correct. Just how I do it
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