Thread: Maximum drain flow through a 1 1/2"
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Old 05-02-2012, 12:00 AM
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This is one calculator I've used in the past and it seems to be really close:
http://beananimal.com/articles/hydra...-aquarist.aspx

According to it a 1 1/2" full siphon (with a submerged discharge) at 4' of head can take over 5000 gph.
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