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<\/p>\nIf your well water has iron, manganese, sulfur odor, or bacteria \u2014 or a combination of all four \u2014 chlorine injection is one of the most effective and cost-efficient treatment methods available. The J-PRO-38 is our recommended metering pump system for residential well water, and it’s a workhorse. But like any treatment system, getting the most out of it requires understanding when to use it, how to size it, and how to set it up correctly for your specific water chemistry.<\/p>\n
In this guide, Gerry from Clean Water Store walks through everything you need to know \u2014 from deciding whether chlorination is right for your situation to setting your pump correctly and choosing between 110V and 220V models.<\/p>\n
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👉 New to chlorination? Start here first: Well Water Chlorination System: How to Set One Up at Home<\/a><\/p>\n The J-PRO-38 is a precision metering pump that injects a measured dose of chlorine solution into your water line each time your well pump runs. It’s paired with a solution tank \u2014 available in 15 or 35 gallon heavy-duty polyethylene \u2014 which holds your diluted chlorine solution. Each time the well pump activates, the J-PRO-38 pumps a precise amount of solution through an injection check valve directly into the water line.<\/p>\n The result is accurate, consistent chlorine dosing every time water is drawn \u2014 without the variability of pellet-style chlorinators or the complexity and cost of ozone systems.<\/p>\n What’s included in the complete J-PRO-38 system:<\/strong><\/p>\n Unlike Stenner-style peristaltic pumps, the J-PRO-38 has no pump tube to fail and no rollers to wear out. Peristaltic pump tubes typically need replacement every 1\u20132 years and are a common failure point. The J-PRO-38 uses a diaphragm metering design \u2014 the same technology found in much more expensive industrial metering pumps \u2014 which requires significantly less maintenance and delivers more accurate, consistent dosing over its lifetime.<\/p>\n Chlorine injection is not the right tool for every well water problem \u2014 but for certain conditions, it’s the best option available. Here’s when Gerry recommends it:<\/p>\n Confirmed or suspected coliform bacteria or E. coli<\/strong> High iron AND manganese together<\/strong> Iron bacteria<\/strong> Hydrogen sulfide (rotten egg odor) combined with iron<\/strong> When is chlorine injection NOT the right choice?<\/strong> Yes \u2014 chlorine injection is commonly used for irrigation systems with iron bacteria or high iron levels. The setup is the same as household use, but sizing must account for your irrigation flow rate, which is typically much higher than household demand. See our guide: Iron in Irrigation Water<\/a>.<\/p>\n 220V (most common for residential wells)<\/strong> 110V with flow sensor (proportional feed option)<\/strong> Proportional feed uses a flow sensor to measure actual water flow and adjusts the chlorine pump stroke rate proportionally \u2014 so the chlorine dose stays accurate regardless of demand. For most residential applications, standard on\/off control tied to the well pump delivers accurate enough results. Proportional feed is most beneficial for irrigation systems or properties with large pressure tanks where pump cycles are infrequent and long.<\/p>\n Sizing a chlorine injection system comes down to three factors: your water flow rate, your contaminant levels, and your contact time.<\/p>\n The J-PRO-38 pumps 2.0 to 38 gallons of solution per day and works for well water flow rates from 0.5 to 50 GPM \u2014 making it suitable for the full range of residential applications. Measure your well pump flow rate using the bucket test method: fill a 5-gallon bucket, time it, divide 5 by the number of seconds, then multiply by 60. Most residential wells run 6\u201315 GPM.<\/p>\n A water test is essential before setting your chlorine dose. You need to know:<\/p>\n 👉 Order a water test first \u2014 here’s our complete guide to well water testing.<\/a><\/p>\n Here are the standard dosing guidelines Gerry uses. For a deeper breakdown see our full post: How Much Chlorine to Inject for Iron and Manganese.<\/a><\/p>\n
\nWhat Is the J-PRO-38 and How Does It Work?<\/h2>\n
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Q: What makes the J-PRO-38 better than a Stenner-style peristaltic pump?<\/h3>\n
\nWhen Is Chlorine Injection the Right Solution for Well Water?<\/h2>\n
\nThis is the clearest case for chlorination. UV disinfection is effective but requires clear, pretreated water to work properly. Chlorine injection disinfects regardless of water clarity and provides a residual that continues working through your plumbing. For confirmed bacterial contamination, chlorination combined with UV at the final stage provides the most comprehensive protection. See our guide: Treating Iron, Manganese, and Coliform Bacteria in Well Water.<\/a><\/p>\n
\nWhen both iron and manganese are present, chlorine injection outperforms both air injection filters and hydrogen peroxide. Hydrogen peroxide performs poorly when manganese is present \u2014 chlorine or ozone is the right oxidant for combined iron and manganese removal. Chlorine oxidizes both simultaneously, converting them to filterable particles before they reach your iron filter.<\/p>\n![\"well](\"https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2023\/07\/iron-bathtub.jpg\")
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\nIron bacteria cannot be solved by filtration alone. They require disinfection upstream \u2014 chlorine injection kills iron bacteria and prevents them from colonizing your filter media. If you skip this step and install a filter without treating for iron bacteria, the bacteria will foul the media and your system will fail early. Learn more: What Are Iron Bacteria?<\/a><\/p>\n
\nChlorine oxidizes hydrogen sulfide, converting it to odorless sulfate. For strong sulfur odors combined with iron, chlorine injection ahead of a backwashing carbon or catalytic carbon filter is one of the most effective treatment sequences available. See: How to Eliminate Odor from Well Water: Chlorination or Aeration.<\/a><\/p>\n
\nIf odor is your only problem with no iron, manganese, or bacteria concerns, hydrogen peroxide injection may be a cleaner option since it breaks down to oxygen and water with no residual. For bacteria-only concerns with very clear water, UV disinfection is a chemical-free alternative. See our comparison: Chlorine vs Hydrogen Peroxide for Well Water Treatment.<\/a><\/p>\nQ: Can I use the J-PRO-38 for irrigation water treatment?<\/h3>\n
\n110V vs 220V \u2014 Which Model Do You Need?<\/h2>\n
\nMost residential well pumps run on 220V. The 220V J-PRO-38 is wired to turn on and off with the well pump \u2014 so every time the well pump runs, the chlorinator runs. This is the simplest and most reliable setup and is what we recommend for the majority of homeowners. The chlorinator draws only 22 watts so it adds virtually nothing to your electricity bill.<\/p>\n![\"Chlorination](\"https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2026\/03\/jpro_38_chlorination_well_water_system.png\")
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\nIf your well pump runs on 220V but you only have 110V available at the installation location, or if you want to add proportional feed \u2014 a flow sensor that adjusts chlorine dose based on actual flow rate rather than just on\/off \u2014 the 110V model is the right choice. The J-PRO-38 comes pre-wired for proportional feed so you can add a flow sensor later if you start with the standard setup.<\/p>\nQ: What is proportional feed and do I need it?<\/h3>\n
\nHow to Size the J-PRO-38 for Your Well Water<\/h2>\n
Step 1: Know Your Flow Rate<\/h3>\n
Step 2: Know Your Contaminant Levels<\/h3>\n
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Step 3: Calculate Your Chlorine Dose<\/h3>\n
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