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Ruth: Midwater pickups to avoid possible stagnant area.
SMG: I am thinking about the airlift tubes for the following reasons:
1) low head required
2) they should act as good degasser/aerator
3) high efficiency
4) simplicity, low maintenance
I think the "paddle wheel" approach as suggested by Peter Menear should work just as well, but might be less effective in pulling water from the bottom drains(my guess).
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