Forces regulating GFR Glomerular Filtration Rate (GFR) The volume of fluid filtered into Bowman's capsule per unit of time. We can estimate the amount of fluid that leaves the glomerulus and enters the Bowman's capsule by the Glomerular Filtration Rate (GFR) GFR can be expressed as a value per day 180L/day filtrate. This equates to about 125ml filtrate created per minute