if up by the surface water, I would think that the solid side should go up to help prevent a vortex drawing air in through the impellar... I don't own one though and that's just my rational thought on it
Yes, up for surface to avoid a vortex, or down to prevent drawing in sand.
Melev is absolutely correct.
Cool thank you, I actually have it mid tank of 30". I have it facing up thinking that it will create more undertow and keep less stuff from settling on the bottom. One day when I can talk my wife into it, I will be getting a second one; as I can't quite make a wish wash throughout the tank. I do get a little bit of swirling, dust devil like movement at the sand but not enough for the sand to make it to the pump.
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