Reserviors improve system flow by keeping the impeller constantly flooded. The improvement in flow is not as noticable when using a MCP350, MCP600, or MCP650. The difference is very noticable when using eheims or mag3s (5s, etc.). Where a 3/4" inlet can be used. I could explain the logic behind this but I'd rather just let empirical data speak for itself. Check out pH's work in the articles section where he integrated a reservior into his mag3.
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