Razorback reef
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How much flow can a 3/4" drain handle? I was thinking ~600 gph and 300-400 would be safe.
How Flow For 3/4" Drain Bulkhead?
- Thread starter Razorback reef
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Mandelstam
Well-Known Member
With just gravity flow it says 660 gph and 6 ft/s on all the charts I've seen so it looks like you are well informed. 
