I recently asked same question ( after 2 + years dealing with it)' my mix is Premium Cyco coco coir, 3 to 1 perlite, 5 gal smart pots ( black- don't care what anyone says the brown smart pots drain slower).?feed each approx 2 gals..sometimes 1 1/2 gal..never less. Runoff about 5 cups ( will verify next feed) and that is draining completely.