A spray bar is basically a way of spreading flow over a greater area than just a plain hose.
If it's used in a sump it's usually to spread the water more evenly over filtration media. (so it sits horizontal)
If your using it in a tank it doesn't really matter which way it goes.
A lot of people mount them horizontal, on or above the water line to agitate the surface and help gas exchange.
A friend of mine runs one vertically aimed across the back of his tank which does a great job of blowing all the crap out from behind his rock work.
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