If you can get the flow to spread out in that 2" reservoir, no worries. Even if you have 1/2" as the minimum ID in your system, a 2" ID provides 8 times the flow area. This means if you're going 3 FPS in the reservoir, you'd be doing 24 FPS somewhere else in the system. This is typically beyond the ability of even "strong" pond pumps. The trick is that flow is not truly uniform across a cross section, hence the recommendation for a screen or similar to break up and distribute the flow in the reservoir.
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