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I'm sure if I search enough I can find this, but thought one of you might know it off the top of your head .. how much charcoal will I need when refilling a vessel 46" tall x 33" in circumference?
33" in circumference = ~10" in diameter. 10" x 47" is the closest tank size I'm aware of. Total volume is 2 cuft. So you'd use 1.5 cuft of 1240 carbon, plus 20 lbs of #20 underbedding. You want the tank no more than about 2/3rds full to allow for expansion during backwash. This should be a downflow backwashing tank. Assuming that you have just plain old chlorine in your feedwater (rather than chloramine), and that you want to shoot for a 2 minute empty bed contact time, you'd want to make sure the feedwater (permeate flow + concentrate flow) to your RO is no more than 5 gpm.