If you only allow return flow to go to the spa and only allow suction to come from the spa, that would do it. So... the handle between the waterfall and the spa returns would be closed to both waterfall returns (handle toward the spa return). Then the 3 way suction valve on the far right would only be open to the spa suction (handle toward the spa suction). Configured this way you would have NO flow to your pool at all.
Did it work? Or did you not get a chance to try it yet? Reason I ask is because the success of our instructions will be based on your pipes being labeled correctly.....
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