Stenner Pumps have a plate on the side of the base. The Gallon Per Day (GPD) of the pump is listed in the lower right hand box on this plate. Use this number for your calculations and ensure that if you have an adjustable rate pump, that the arrow is pointing to the 5 (50%).
Neptune Pumps have a plate on the back and have to be identified by their part number. PZ31 is an 11 GPD pump and the PZ61 is a 22 GPD pump. Use this number for your calculations and ensure that the dial is set to 5 (50%).
LMI Pumps have a plate on the back and have to be identified by their model number. P03 is a 10 GPD pump and the P05 is a 24 GPD pump. Use this number for your calculations and ensure that the dial is set to 5 (50%).