Injection Pumps

How a Chemical Injection System Works

An injection system is more than a pump. Each part of a well water injection system has a job, and the order matters:

• Well pump and pressure tank: supply the water and switch the injection pump on and off.
• Injection pump: doses the chemical into the water line, before or after the pressure tank.
• Mixing or retention tank: gives the chemical time to react with the water.
• Backwashing or carbon filter: captures what the chemical oxidized and reduces leftover chemical.

Powered by Your Well Pump

In a typical install, the injection pump plugs into an outlet wired to your well pressure switch. That outlet only has power while the well pump runs, so the injection pump doses only when water is moving through the line. There are no timers to set and no guessing when to feed.

Contact Time and the Retention Tank

Chemicals need time in contact with the water to do their work. A mixing or retention tank after the injection point provides that time before water reaches your filters.

The Automated Pure Water Chemical Mixing Retention Tank uses 2 built-in mixing chambers and 2 swirl chambers to break the water into micro bubbles. It's designed to cut the necessary contact time by up to 80%.

Removing Excess Chemical After Treatment

Once the chemical has done its job, a downstream filter captures the oxidized particles and reduces leftover chemical before water reaches your taps. For chlorine and hydrogen peroxide systems, catalytic carbon systems are a common final step.

Match the Chemical to Your Water Problem

The right chemical depends on what's in your water, so the starting point is always a water test. Iron, sulfur, bacteria, and low pH each call for a different approach, and many wells have more than one.

Chlorine for Iron, Sulfur Odor and Bacteria

Chlorine is one of the most common injection chemicals for well water. It oxidizes dissolved iron and hydrogen sulfide so a downstream filter can capture them, and it's a long-standing method for disinfecting well water. The standard Santoprene tube in Stenner pumps is rated for household bleach.

Pair chlorine injection with one of our iron and sulfur filters to catch what the chlorine oxidizes.

Hydrogen Peroxide for Rotten Egg Odor

Hydrogen peroxide is a strong oxidizer that targets the rotten egg odor caused by hydrogen sulfide. Pro Neutra Sul Pro Products HP41N Professional Grade Oxidizer is formulated to neutralize rotten egg smells and protect against irregular coloring in treated water. The standard Santoprene tube in Stenner pumps is rated for hydrogen peroxide under 50%.

Soda Ash for Acidic, Low-pH Water

Acidic water with very low pH can corrode copper plumbing and fixtures, and soda ash injection raises pH at the source. Our Soda Ash Injection System for Acidic Water includes a 50 lb. bag of soda ash, the Stenner 85MHP17 adjustable injection pump, and a 15-gallon solution tank. A second version adds the mixing/retention tank.

For other ways to correct pH, see our full range of pH treatment systems.

Why Stenner Injection Pumps

Stenner pumps use a peristaltic design. Rollers squeeze a flexible tube to move the chemical, so the chemical only contacts the tube inside the pump head, and there's no priming hassle. They self-prime up to 25 feet, won't vapor lock or lose prime, and use snap-fit components that make tube changes quick.

The 85MHP17, for example, is WQA tested to ANSI/NSF Standard 60 and ETL tested to ANSI/NSF Standard 50. It carries a 1-year manufacturer's warranty.

Stenner 85MHP17: The Most Common Choice

The Stenner 85MHP17 is the most commonly used model. It's widely used for chlorine and soda ash injection and suits just about any chemical injection application. Output is adjustable, so you can set the dose to your water. It comes with an installation kit and a 110V power supply, with 220V available.

It's available on its own as the Stenner Injection Pump 85MHP17 NO TANK, or paired with a tank as the Stenner Injection Pump 85MHP17 & 15 Gal. Solution Tank.

Stenner 45MHP10 for a Different Output Range

Stenner builds models with different outputs for applications that need a different dose range than the 85MHP17. The Injection Pump 45MHP10 NO TANK shares the same adjustable, self-priming design. It fits when your dosing calculation points to a different output.

Proportional Injection for Variable-Speed Well Pumps

Wells with variable-speed pumps need dosing that follows the flow, not just the pump's on-and-off cycle. The Stenner Proportional Injection System provides reliable dosing for applications that can't connect directly to a well power supply. Treatment stays consistent as demand changes.

Choosing Your Injection Pump or Complete System

Start with a water test kit so you know which chemical you need and roughly how much. Then match the equipment to your setup.

Match Voltage to Your Well Power Supply

The pump runs off the same circuit as your well pump, so the voltage has to match. Stenner pumps come with a 110V power supply, and 220V is available. Pick the one that matches your well power supply.

Pump Only or Complete System

If you already have a solution tank, retention tank, and filter in place, a pump on its own is all you need. For a new install, a pump with a solution tank or a complete soda ash system puts matched pieces together from the start.

Solution Tank Size

The 15-gallon solution tank comes with our pump-and-tank packages. For fewer refills, the Polyethylene 35 Gallon Chemical & Solution Tank holds more than twice as much. Its rugged polyethylene build works indoors or outdoors with soda ash, chlorine, and hydrogen peroxide.

Keep Your Pump Dosing Accurate

The pump tube is the part that wears, and a worn tube can throw off your dose. Keeping spare parts on hand turns a repair into a quick swap instead of days without treatment.

• Stenner Replacement Tubes #2 - 2 pack: #2 Santoprene tubes, the default size and material for Stenner pumps.
• Stenner HPACK-2 accessory kit with #2 tube, suction parts, and injector parts: The common wear parts in one kit.
• Stenner injector check valve 1/4": A replacement injector check valve for Stenner pumps.
• Stenner Tube Housing Cover W/ Bushing: A replacement cover for the pump's tube housing.