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Hydrogen Peroxide Injection System for Well Water in Michigan

By Kyle Wood, Water Treatment Specialist • Updated May 2026 •
Serving Brighton, Howell & Livingston County, Michigan

What Hydrogen Peroxide Injection Treats — and When It’s the Right Choice

Most Michigan well water problems with iron, sulfide, and iron bacteria can be resolved with an air injection oxidizing filter. Hydrogen peroxide injection is the step up when:

Hydrogen sulfide (H&sub2;S) above 1–2 mg/L: Air injection drives off dissolved H&sub2;S through aeration, but at concentrations above 1–2 mg/L the aeration contact time in a standard residential tank is insufficient to achieve complete odor removal. The sulfur smell persists at some fixtures or under high-flow conditions. Hydrogen peroxide injection oxidizes H&sub2;S chemically — the reaction is nearly instantaneous and is not limited by contact time or flow rate the way aeration is. The result is complete odor elimination regardless of concentration. See our guide to sulfur smell in Michigan well water.

Iron bacteria that recur after shock chlorination: Iron bacteria live in the aquifer and repopulate the distribution system continuously from incoming well water. Shock chlorination kills the existing colony but provides no protection against recolonization. Hydrogen peroxide injection kills iron bacteria in every gallon of water entering the system — bacteria cannot survive the oxidizing environment. The peroxide fully decomposes in the catalytic carbon filter, leaving no residual. See our guide to iron bacteria in Michigan well water.

Combined iron + sulfide + bacteria in the same well: Many Livingston County wells have overlapping contamination — elevated iron, H&sub2;S odor, and iron bacteria together. Hydrogen peroxide addresses all three with a single injection point. It oxidizes both iron and H&sub2;S, kills bacteria, and the downstream catalytic carbon filter removes the oxidized precipitate. This eliminates the need for separate treatment devices for each contaminant.

When chlorine injection is not acceptable: Chlorine injection (sodium hypochlorite) is an alternative oxidizing disinfectant, but it produces disinfection byproducts (trihalomethanes, haloacetic acids) when reacting with organic compounds in the water, and leaves a chlorine residual that affects taste and requires additional carbon filtration. Hydrogen peroxide decomposes cleanly into water and oxygen — no byproducts, no residual, no taste effect. For households with chemical sensitivity or concern about DBPs, H&sub2;O&sub2; is the preferred disinfectant.

When you should use air injection instead: Air injection oxidizing filters are lower cost, require no chemical supply, and are highly effective for iron below 5 mg/L and H&sub2;S below 1 mg/L without bacterial contamination. If your water profile fits that range, an air injection iron filter is the more appropriate starting point. See our guide to air induction iron filters for Michigan wells.

How a Hydrogen Peroxide Injection System Works

A properly designed H&sub2;O&sub2; injection system has three primary components: the metering pump, the contact tank (or inline contact pipe), and the catalytic carbon filter. Each is essential — omitting any component creates a system that either fails to treat the water or leaves peroxide residual at the tap.

Component 1: Chemical metering pump

A diaphragm-type metering pump injects a precise volume of diluted hydrogen peroxide solution into the water supply line on every pump cycle. The pump is triggered by the well pump pressure switch — it injects only when water is flowing. The injection rate (measured in ml/hour or gallons/day) is adjusted to deliver the correct H&sub2;O&sub2; dose proportional to the well pump flow rate. For a typical Michigan residential well flowing at 8–12 GPM with H&sub2;S at 1–3 mg/L, the injection rate produces approximately 1–3 ppm H&sub2;O&sub2; in the water stream. Common pump brands used in residential Michigan installations include Stenner and Blue-White — both are reliable peristaltic or diaphragm designs with adjustable output.

Component 2: Chemical solution tank

The metering pump draws from a solution tank containing diluted food-grade hydrogen peroxide. For residential use, 3–7% H&sub2;O&sub2; solution is typically used (diluted from 35% food-grade concentrate, or purchased pre-diluted). A standard 15–30 gallon solution tank requires refilling every 1–3 months depending on usage. The solution tank must be kept out of direct sunlight and away from heat — H&sub2;O&sub2; degrades to water and oxygen when exposed to light or heat.

Component 3: Contact tank or retention loop

After injection, the H&sub2;O&sub2;-treated water needs approximately 30 seconds of contact time to fully oxidize dissolved iron and sulfide before reaching the catalytic carbon filter. In many Michigan residential installations, the existing pressure tank provides sufficient contact volume. In others, a dedicated inline retention coil or contact tank is added between the injection point and the carbon filter. The contact time requirement depends on iron and H&sub2;S concentration — higher levels require longer contact.

Component 4: Catalytic carbon filter

The catalytic carbon filter (typically a 10×54" or 12×52" tank filled with catalytic carbon media) performs two functions downstream of the injection point: it removes the oxidized iron and sulfide precipitate from suspension, and it completely decomposes any residual H&sub2;O&sub2; that has not already broken down. Catalytic carbon (Centaur or equivalent) is highly efficient at H&sub2;O&sub2; decomposition — the peroxide is fully consumed within the first few inches of the carbon bed. The result is clean, odor-free water with no iron, no sulfide, and zero peroxide residual. See our guide to whole-house carbon filters for Michigan well water.

Hydrogen Peroxide vs. Air Injection vs. Chlorine Injection: Comparison for Michigan Wells

Hydrogen Peroxide Safety and Food-Grade H&sub2;O&sub2; for Drinking Water

The hydrogen peroxide used in well water treatment systems is food-grade H&sub2;O&sub2;, which is approved for use in food processing and drinking water treatment by the FDA and EPA. The key safety facts for Michigan well owners:

Food-grade vs. drugstore H&sub2;O&sub2;: Standard 3% hydrogen peroxide from a pharmacy contains stabilizers that are not suitable for drinking water injection. Food-grade H&sub2;O&sub2; (typically purchased at 35% concentration and diluted to 3–7% for use) contains no stabilizers or additives. Do not use cosmetic or industrial grades. Your water treatment supplier will specify the correct grade.

Handling concentrated H&sub2;O&sub2;: 35% food-grade H&sub2;O&sub2; is a strong oxidizer. It causes skin irritation and eye damage on contact. Always wear gloves and eye protection when handling the concentrate. Dilute to working concentration before adding to the solution tank. Store away from flammable materials and out of reach of children.

No residual at the tap: At the dosing rates used in residential well treatment (1–5 ppm), catalytic carbon fully decomposes all H&sub2;O&sub2; before the water reaches any indoor fixture. Independent testing of properly designed systems shows undetectable H&sub2;O&sub2; at the tap. This is why the catalytic carbon component is not optional — the system requires it for complete decomposition.

NSF/ANSI 60 certification: Hydrogen peroxide for drinking water use should be NSF/ANSI 60 certified as a drinking water treatment chemical. Your water treatment contractor should source certified H&sub2;O&sub2; and document it for your records.

Complete Michigan Well Water Treatment System with H&sub2;O&sub2; Injection

For a Livingston County well with the full combination of problems (iron, hardness, H&sub2;S odor, iron bacteria), the complete treatment train in correct sequence:

Stage 1: Sediment pre-filter — 20–50 micron cartridge or backwashing sediment filter upstream of everything. Removes sand, silt, and particulate iron before any treatment equipment. Protects metering pump, carbon media, and softener resin from fouling.

Stage 2: H&sub2;O&sub2; injection point — metering pump injects diluted H&sub2;O&sub2; into the main supply line downstream of the sediment filter. Injection point is typically on the cold supply line between the pressure tank and treatment equipment, allowing the pressure tank volume to serve as the contact vessel.

Stage 3: Contact time — the pressure tank or a dedicated retention coil provides 30–60 seconds of contact time for oxidation reactions to complete before the water enters the carbon filter.

Stage 4: Catalytic carbon filter — removes oxidized iron, manganese, and sulfide precipitate; decomposes residual H&sub2;O&sub2;; adsorbs any remaining trace odors. Backwashes on a timer (typically weekly). Media replacement every 1–2 years depending on contaminant load.

Stage 5: Water softener — removes calcium and magnesium hardness. Positioned after the carbon filter so that iron-free, peroxide-free water enters the softener resin, protecting the resin from fouling and oxidative damage.

Stage 6: UV disinfection — final polishing stage for bacterial kill, positioned downstream of all treatment equipment where the water is clear and free of iron (iron absorbs UV and reduces effectiveness). See our guide to UV disinfection for well water Michigan.

For wells where iron bacteria is the primary concern but iron and hardness levels are low, the system simplifies to: sediment filter → H&sub2;O&sub2; injection → catalytic carbon filter → UV disinfection.

H&sub2;O&sub2; System Sizing for Michigan Residential Wells

Correct sizing requires a water test that quantifies iron, H&sub2;S, manganese, and pH. The injection dose is calculated from these values:

For iron removal: Approximately 0.5 mg/L H&sub2;O&sub2; is required to oxidize each 1 mg/L of dissolved iron. A well with 3 mg/L iron needs at least 1.5 ppm H&sub2;O&sub2; in the treated stream (before the carbon filter) for complete oxidation.

For H&sub2;S removal: Approximately 1 mg/L H&sub2;O&sub2; is required per 1 mg/L of H&sub2;S. A well with 2 mg/L H&sub2;S needs at least 2 ppm H&sub2;O&sub2;. In practice, a modest excess (20–30% over stoichiometric) is dosed to account for flow rate variation and ensure complete reaction.

For iron bacteria: The continuous oxidizing environment created by even low-level H&sub2;O&sub2; injection (0.5–1 ppm) is bactericidal. Iron bacteria cannot colonize a distribution system that continuously receives oxidized water. The bacteria dose is typically lower than the iron/sulfide dose.

Metering pump sizing: The pump output in ml/hour is calculated from the target dose (ppm), the well pump flow rate (GPM), and the H&sub2;O&sub2; solution concentration. For a typical 10 GPM Michigan residential well dosed at 2 ppm from a 3% solution, the required pump output is approximately 4–6 ml per liter of flow. A Stenner 45M5 or equivalent peristaltic pump covers this range with adjustment room for changes in demand.

Catalytic carbon tank sizing: For H&sub2;O&sub2; injection applications, a 10×54" catalytic carbon tank (1.5 cu ft of Centaur or equivalent media) handles most residential Michigan applications up to 12 GPM. Higher flow rates or high iron loads warrant a 12×52" tank. See our complete sizing discussion in the carbon filter guide.

Installed Cost of H&sub2;O&sub2; Injection Systems in Livingston County

Annual operating cost for a typical Livingston County H&sub2;O&sub2; injection system: approximately $350–$700/year including chemical supply and carbon media replacement. Compare to the alternative of drinking sulfur-odored water, recurring iron bacteria slime, and the health risk of uncontrolled bacterial contamination.

See our complete cost breakdown in the Michigan well water treatment system cost guide.

Maintenance Requirements for H&sub2;O&sub2; Injection Systems

Monthly checks: Verify the solution tank level and refill as needed. Check that the metering pump is drawing solution and injecting on each pump cycle (you can observe this by watching the solution level drop during a high-demand period or by checking the pump draw tube for visible flow). Inspect the injection fitting for scaling or mineral buildup.

Every 3–6 months: Test the treated water at a tap downstream of the carbon filter for iron and H&sub2;S to confirm the injection dose is still effective. If odor or iron returns, the injection rate may need adjustment (well water chemistry can shift over time) or the carbon media may be approaching exhaustion.

Annually: Replace catalytic carbon media. The H&sub2;O&sub2; decomposition reaction gradually reduces the catalytic activity of the carbon surface. Unlike standard GAC carbon, catalytic carbon used in H&sub2;O&sub2; applications exhausts primarily through loss of catalytic surface area rather than adsorption capacity. Annual replacement is standard for Michigan wells with active H&sub2;O&sub2; injection. Pure Water Filtration includes annual media replacement in our maintenance program for Livingston County customers.

Pump tubing inspection: Peristaltic pump tubing (on Stenner-type pumps) should be inspected annually and replaced every 1–2 years. The tubing is the primary wear component. A cracked or failed tube stops injection without any visible alarm. If the sulfur odor or iron suddenly returns, a failed pump tube is among the first things to check.

Annual water test: Confirm iron, H&sub2;S, coliform, and E. coli levels annually. H&sub2;O&sub2; injection does not provide unconditional disinfection protection — a failing metering pump or exhausted carbon filter removes the treatment. Annual testing verifies the system is performing. See our guide to annual well water testing and maintenance in Michigan.

Why Michigan Wells Specifically Benefit from H&sub2;O&sub2; Injection

Livingston County and surrounding Washtenaw, Oakland, and Ingham County well water frequently has the combination of conditions that makes H&sub2;O&sub2; injection the appropriate choice: moderate-to-high iron (2–8 mg/L), dissolved hydrogen sulfide from anaerobic aquifer conditions, and iron bacteria colonization. The glacially derived geology of southeast Michigan produces these groundwater characteristics in a large percentage of residential wells.

Air injection iron filters — the standard first-line treatment — handle most of this effectively when iron is below 5 mg/L and H&sub2;S is below 1 mg/L. For wells that exceed those thresholds, or where iron bacteria recurs despite repeated shock chlorination, H&sub2;O&sub2; injection is the step up. It is not the right system for every Michigan well, but for the wells where air injection has not achieved the result, it reliably delivers clean, odor-free, bacteria-free water.

Pure Water Filtration has designed and installed H&sub2;O&sub2; injection systems for Michigan well owners across Livingston County since the company was founded. We start every evaluation with a free on-site water test — there is no point designing a system without knowing exactly what the water contains.