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Yea my bet is he wants something with a smaller size, lower weight and smaller outlet. The one you linked to is quite large (50cm+), quite heavy (29kg) has a large outlet (3 inch). I understand you don't have to run it at full thottle but the 1000LPM max flow seems like a little bit of overkill. I know a few people do use these but still think its overkill. Just my thoughts.
How are you going to feed the water into it Jeff. Looking at your pic that looks more of a river sluice and would need to be re designed to feed water via a pump.