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Originally Posted by panmanmatt  The 90 will cause the pump to draw from lower in the sump. I had to add it to mine cause the pump kept pulling in air from the water's surface. This also allows you to run a lower water level in the sump to allow room for back flow when the pumps are off. |
All good points. However a 90 will restrict the intake to a certain point. too much, & the pump will cavitate . If the 90 is stuck in a corner or close to a wall it will just add to the restriction. Consider using a 90 only if necessary.