If you are treating your well water with chlorine, you need a reliable injection pump that delivers consistent performance. The Stenner 45M5 series has long been a trusted choice for homeowners and professionals alike. In this guide, we review four popular Stenner 45M5 models to help you select the right pump for your chlorine injection system.
Each pump is built by Stenner Pump Company, a manufacturer with decades of experience. We evaluate fixed and adjustable output options, pressure ratings, and tubing configurations to match different well water treatment needs.
Pros
- Exceptional reliability – users report 5+ years with minimal issues
- Easy maintenance – annual tube change is straightforward
- Self-priming and stays primed – no air lock problems
- Consistent output – fixed speed ensures repeatable dosing
- High-quality Santoprene tubing resists degradation
Cons
- No automatic shutoff if tube ruptures – requires monitoring
- Fixed speed limits flexibility – not adjustable for varying flow needs
- Price point may be high for casual home users
The Stenner 45MP5 is a fixed-speed peristaltic metering pump designed for precise chemical injection in pools, water treatment, and industrial applications. With a flow rate of 50 gallons per day at 25 PSI, it is ideal for consistent dosing of chlorine, acids, or other liquids without pulsation.
Users consistently praise its reliability, with many reporting years of trouble-free operation. The pump features a Santoprene tube that resists chemical attack and requires only annual replacement to maintain peak performance. The improved design makes tube changes easier than older models, though there is no automatic shutoff if the tube fails.
Built by Stenner Pump Company since 1957, this pump exemplifies durable construction. The fixed-speed motor runs on 120V and includes 20 feet of 3/8 inch black tubing for quick setup. Its self-priming capability eliminates common priming issues seen with diaphragm pumps.
One drawback is the lack of flow adjustment; the fixed 50 GPD output cannot be varied. Additionally, the pump does not include a safety shutoff in case of tube rupture, so users should monitor operation. The price reflects professional-grade quality.
Overall, the Stenner 45MP5 is a top-tier choice for those needing a reliable, low-maintenance peristaltic pump. Its proven track record and ease of service make it a worthwhile investment for pool owners, water treatment professionals, and agricultural users.
Model: 45MFL5A3SUAA
Flow Rate: 50 GPD (fixed)
Pressure: 25 PSI
Power: 120V, 60Hz
Tube Material: Santoprene
Included Tubing: 20 ft of 3/8 inch black
Weight: 7 pounds
Style: Above Ground
Pros
- Long service life; reviewers have used predecessors for nearly 20 years.
- Effective for chlorine injection into water systems, with repeat purchase loyalty.
- Self-priming against pressure and degasses automatically.
- Adjustable output and 100 psi rating handle many residential and light commercial jobs.
Cons
- Ships as pump/motor assembly only, without accessories and manual.
- Some units may be branded Aquasol rather than Stenner, which could matter for purists.
- Lacks clear listing disclosure about included items; buyers need to verify before ordering.
The Stenner 45MHP10 is a single-head peristaltic metering pump designed for precise chemical injection in water treatment and irrigation systems. It suits homeowners, well owners, and small commercial operators who need a dependable way to inject chlorine, pH adjusters, or other liquid treatments.
The standout benefit is the peristaltic design. It self-primes against pressure, automatically degasses, and can draw from up to 25 feet away. The pump delivers 10 gallons per day at 100 psi, and the adjustable output lets you fine-tune the feed rate to match your system. A 26 RPM gear driven motor keeps operation consistent and simple.
Build quality is solid, with cast iron and stainless steel materials that handle harsh environments. Users report these pumps lasting many years, with one reviewer maintaining a unit for nearly two decades. This type of longevity makes it a strong investment for critical water treatment setups.
The main drawback is packaging. The listing presents the pump as a complete product, but it ships as the pump and motor assembly only. Tubing, quill, ferrules, check valve, and even a manual are not included. Some buyers also received an Aquasol unit rather than a pump with Stenner branding, though the design appears identical.
Overall, the 45MHP10 delivers reliable performance for chemical feed applications. If you already have the fittings and tubing or know what to purchase separately, this pump is a durable and effective choice. If you need a ready-to-install kit, confirm the included accessories before ordering.
Before ordering, note that this item is the pump and motor assembly only. It does not include the typical accessories found with a retail Stenner package. You may need to buy injection quill, tubing, ferrules, check valve, and mounting hardware separately.
For installation, the pump can mount near your injection point or up to 25 feet away due to its strong priming capability. Use tubing with a compatible diameter to maintain the 10 GPD flow rate. The adjustable output allows you to dial in the exact chemical dosage needed for your system.
If you expect a box with a manual and all fittings, contact the seller before purchase or order the accessory kit separately. The pump itself performs as expected for chlorine and other chemical injections, so the main issue is simply setting clear packaging expectations.
Pros
- Easy to install with straightforward setup as noted by users
- Great as a replacement pump for existing chemical injection systems
- Thermally protected motor helps prevent overheating and failure
- Compact and lightweight for flexible mounting options
- Adjustable pressure up to 25 PSI for various dosing needs
Cons
- Requires upside-down mounting in some setups, limiting compatibility
- May shut off after 45 minutes of continuous use due to thermal protection
- Not suitable for all well pump configurations without modification
The Stenner 45MJL5A1STAA is a specialty adjustable pump designed for injecting chemicals into water systems, particularly for pools or well water treatment. It is best suited for homeowners or professionals needing precise chemical dosing.
With an adjustable output and 25 PSI pressure, this pump offers flexibility for various applications. User reviews highlight easy installation and reliable operation, though some note thermal shutdown after extended use.
The pump features a durable plastic body that resists chemical corrosion and weighs only 16 ounces, making it easy to mount. It operates on standard 110V power and includes spare parts for long-term maintenance.
A potential drawback is the requirement for upside-down mounting in some setups, which may not be feasible for all well pumps. Additionally, the thermal protection can cause the pump to stop after 45 minutes of continuous use, which may be inconvenient.
Overall, the Stenner 45MJL5A1STAA is a solid choice for those needing a compact, adjustable chemical injection pump. Consider your mounting options and usage patterns before purchase.
Power Source: Corded Electric
Material: Plastic
Style: Above Ground
Item Weight: 16 ounces
Model: 45MJL5A1STAA
Brand: Stenner Pump Company
Pressure: 25 PSI
HP: 1/30
Voltage: 110V
Pros
- Adjustable feed rate provides precise control over chemical dosing.
- Includes all necessary accessories for quick setup.
- Santoprene tube resists chemicals and wear.
- Compact, reliable design trusted in water treatment.
- Simple corded electric operation.
Cons
- Premium price point reflects its professional-grade build.
- Maximum pressure of 25 psi may not suit high-pressure systems.
- No built-in timer or digital controller; external controls may be needed.
The Stenner Pump Company 45m5 is a peristaltic metering pump designed for precise chemical injection, particularly chlorine, in water treatment applications. With an adjustable head that delivers 2.5 to 50 gallons per day at up to 25 psi, this pump suits residential well systems, small commercial facilities, and emergency preparedness setups.
The standout feature is its adjustable feed rate, which allows users to dial in the exact dosage needed without complex controls. The included Santoprene tube resists chemical degradation and flex fatigue, ensuring consistent performance over time. The pump comes with 20 feet of white tubing, a weighted strainer, an injection check valve, and a mounting bracket, so it is ready to operate out of the box.
Built with a polypropylene head and a durable electric motor, the 45m5 is crafted for reliable, low-maintenance service. The 120V corded design makes installation straightforward, and the simple peristaltic mechanism minimizes mechanical wear. This is a professional-grade unit that prioritizes longevity and accuracy.
Potential drawbacks include a higher price point than basic hobbyist pumps and a maximum pressure rating of 25 psi, which may limit use in high-pressure systems. Additionally, the pump lacks a built-in timer or digital controller, so users may need to add an external timer for fully automated dosing.
Overall, the Stenner 45m5 is a worthwhile investment for anyone who needs dependable, repeatable chemical dosing. Its robust construction, complete accessory kit, and proven peristaltic technology make it a top choice for chlorine injection and other water treatment tasks.
Flow Rate: 2.5 to 50 gallons per day
Pressure Rating: 25 psi
Voltage: 120V AC, 60 Hz
Tube Size: 3/8 inch suction and discharge
Tube Material: Santoprene
Included: Mounting bracket, injection check valve, weighted strainer, 20 ft white tubing, spare pump tube
Buying Guide: What to Look for in a Stenner 45M5 Pump
Output Capacity (GPD)
The gallons per day (GPD) rating determines how much chlorine solution your pump can deliver. For typical household well water, a pump with a range of 2.5 to 50 GPD covers most needs. The fixed 50 GPD model is ideal for consistent dosing, while adjustable pumps let you fine-tune the flow rate. Consider your water usage and chlorine demand when choosing. For more guidance on pump sizing, see What Pump Do I Need for My Well?.
Pressure Rating
Stenner 45M5 pumps are available with pressure ratings of 25 psi or 100 psi. If your system operates at standard well pressure, a 25 psi pump is sufficient. For higher pressure applications, the 100 psi adjustable model provides extra headroom. Always match the pump pressure to your injection point requirements.
Adjustability and Ease of Use
Some Stenner 45M5 pumps offer adjustable output, allowing you to dial in the exact flow rate without changing tubing. This is valuable if your water quality varies seasonally. Fixed speed pumps are simpler and require less maintenance. Choose based on your preference for flexibility versus simplicity. A well pump with soft start can complement an adjustable injection pump for smoother operation.
Build Quality and Durability
Stenner pumps are known for their robust construction. The peristaltic design uses a Santoprene tube that resists chemical wear. The gear-driven motor provides reliable long-term operation. When selecting a pump, consider the included accessories like injection check valves and tubing lengths, which contribute to overall system reliability. For a complete setup, explore our well pump kit buying guide.
Final Thoughts
After evaluating these four Stenner 45M5 pumps, we recommend the Stenner Pump 45MP5 Pump Fixed 25 psi 50 GPD for users who need a straightforward, reliable fixed-output pump for consistent chlorination. For those who want versatility, the Stenner Pump Company 45m5 adjustable model offers a wide output range from 2.5 to 50 GPD, making it suitable for varying water conditions. Both pumps deliver the quality and performance expected from Stenner.
Frequently Asked Questions
What is a Stenner 45M5 pump used for?
The Stenner 45M5 is a peristaltic pump designed for injecting chlorine or other chemicals into water systems. It is commonly used for well water chlorination to eliminate bacteria and improve water quality. The pump is self-priming and can handle a variety of chemical solutions.
How do I choose between fixed and adjustable Stenner pumps?
Fixed output pumps are best if you have a consistent chlorine demand and prefer a simple setup. Adjustable pumps allow you to change the flow rate without replacing tubing, giving you flexibility to adapt to seasonal changes in water usage or quality. Consider your long-term needs when deciding.
What tubing size does the Stenner 45M5 use?
Most Stenner 45M5 pumps come with 3/8 inch suction and discharge tubing. The tube material is Santoprene, which is resistant to chlorine and other chemicals. The pump includes 20 feet of tubing and necessary fittings for installation.
Is the Stenner 45M5 pump reliable for long-term use?
Yes, Stenner has been manufacturing peristaltic pumps since 1957, and the 45M5 series is known for its durability. The gear-driven motor and high-quality tubing ensure consistent performance over many years. Regular maintenance, such as replacing the tube periodically, will extend the pump’s life. For more on well pump reliability, see our guide on quiet well pumps.
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