ShinMaywa Norus Submersible Pump

Step 1: Estimate your system’s total head pressure.

Step 2: Find your estimated total head pressure across the top of the chart.

Step 3: Read down that column to compare each pump model’s flow rate in GPM (Gallons Per Minute) and GPH (Gallons Per Hour).

Step 4: Choose the pump that provides the flow your waterfall or water feature requires at your operating head pressure.

For example, if your system has approximately 20 feet of total head, the 50CR2.75S pump will deliver roughly 80 GPM (4,800 GPH), while the 50CR2.4S will produce approximately 45 GPM (2,700 GPH).

Step 1: Measure vertical head pressure by measuring the vertical distance in feet from the pumping water level to the highest point the water must reach.

Step 2: Measure the distance of the pipe tube you’ll be using from the pump to the waterfall and divide by 10.

Step 3: Add the results from steps 1 and 2 to get your answer.

Example: You are using 20 feet of pipe tubing and the vertical height from your pump to your waterfall outlet is 6 feet, this means your head pressure is 8 feet.

(20/10) + 6 = 8 Feet Head Pressure

Many customers assume that head pressure is simply the vertical distance the water in your system is pumped. In reality, it’s the combined resistance created by:

• Vertical lift
• Pipe length
• Pipe diameter
• Elbows and fittings
• Valves
• Filters or UV clarifiers
• Waterfall spillways or discharge restrictions

Even a pump moving water only 8 feet upward may experience 20–30 feet of head pressure once plumbing losses are included. The greater the head pressure, the harder the pump must work.