What factors play a part in the glomerular filtration rate?

What factors play a part in the glomerular filtration rate? What is the main factor that determines the rate of glomerular filtration? How is the glomerular filtration rate regulated? The glomerular capillaries are fenestrated, diameter of the efferent arteriole is smaller than the diameter of the afferent arteriole, the visceral layer of the glomerular capsule is porous. Molecular weight and electrical charge affects filtration pressure, the amount of filtrate produced by the kidneys each day, how much bowel you put out.