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Some sort of test section that you can immerse in the river, with an upstream difusser and a window against a backdrop so you can see?
edit:
A scond-hand aquarium with the ends knocked out might be a good donor.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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Last edited by freebeard; 07-15-2023 at 12:37 AM..
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