A decrease in GFR will cause lower Na and Cl ion concentration in the distal tubule
GFR stands for Glomerular Filtration Rate
The rate at which kidneys filter blood is called the glomerular filtration rate
The main driving force for the filtering process, or outward pressure is the blood pressure as it enters the glomerulus which is counteracted to some extent by inward pressure due to the hydrostatic pressure of the fluid within the urinary space, and the pressure generated by the proteins left in the capillaries that tend to pull water back into the circulatory system (colloidal osmotic pressure)
The net filtration pressure is the outward pressure minus the inward pressure
