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Household Bleach is 5 1/4% Sodium Hypochlorite

Liquid Pool Chlorine is 12 1/2% Sodium Hypochlorite

Introduction to Metering Systems

A chlorine metering pump sizing calculator helps determine the correct pump output for accurate water treatment. Metering systems play a vital role by ensuring the right amount of chlorine solution is added to your water supply. The metering pump delivers a precise dose for reaching the desired parts per million (ppm) of chlorine. To size your pump correctly, you must consider the well pump’s flow rate, target dosage, and solution strength.

Please Note: Using the Chlorine Metering Pump Sizing Calculator

Our calculator provides a good starting point, but once you start feeding chlorine into the water system, always measure chlorine residuals downstream of the injection point. Factors like temperature, pH, and chlorine solution type can affect dosage. Chlorine is added to treat bacteria, odors, or iron.

You can adjust your chlorinator to achieve the desired chlorine residual using a simple chlorine test kit.

Make fresh chlorine solution monthly, as it loses strength over time and is sensitive to heat and light. Keep the solution tank out of sunlight for best results.

How To Determine Pump Size and Set Speed and Stroke for Proper Dosage

1. Determine the water flow rate in Gallons Per Minute (GPM) or Liters Per Minute (LPM).
2. Determine the desired chlorine concentration in parts per million (PPM).
3. Use the formula below to calculate gallons per day and select the pump.
4. Adjust the metering pump output to achieve proper dosage.

Formula:
(GPM) × (ppm dosage) × 1440 ÷ (solution strength in ppm) = GPD

Household bleach is about 5% chlorine; pool chlorine is 10–12%.

For example, diluting 1 gallon of bleach with 9 gallons of water yields a 0.5% (5000 ppm) solution strength.

Adjust the metering pump output and solution strength to vary chlorine dosage.

Example:
With a 12 GPM well pump and 2.0 ppm chlorine target using 5000 ppm solution:

12 × 2.0 × 1440 ÷ 5000 = 6.9 gallons per day

Select a pump with about 6.9 GPD output; many pumps are adjustable for fine-tuning.

If your well pump runs 1 hour/day, you’d use 6.9 gallons of solution every 24 days. To maintain strength, replace the solution every 1–2 months.

Always test for total and free chlorine and adjust the pump or solution strength to maintain the desired free-chlorine residual (commonly 0.2–0.6 ppm). High iron levels may increase chlorine demand.

If no free chlorine residual is detected after injection, increase the pump output or the solution strength.

Flow Rate Management

Managing flow rate is essential for proper chemical dosing in your water treatment system. The flow rate of your well pump, measured in gallons per minute (GPM), affects how much chlorine your metering pump must inject to reach the desired ppm. First, determine your well pump’s maximum flow rate using a chart, calculator, or by measuring output directly. Then, adjust your metering pump output to match that flow rate. Changes in water demand or pressure can impact this. Pipe size, friction loss, and pump pressure also influence flow rate. Monitoring and adjusting as needed ensures your system delivers the correct chemical concentration for safe, clean water.

Chemical Concentration and Dosage

Accurate chemical concentration and dosage are vital for effective treatment. The strength of your chlorine solution, expressed in percentage or ppm, determines how much you need. You may need to dilute your solution to reach the proper concentration. To calculate the right dosage, factor in your pump’s flow rate, your target ppm, and the solution strength.

For example, to achieve 2 ppm using a 5,000 ppm chlorine solution, calculate the injection rate based on your system’s flow. Adjust as needed to meet safety and quality standards.

System Optimization

System optimization improves performance and cuts costs. Fine-tune pump sizing, flow rate, and chemical levels to match your system’s needs. Use a calculator or software to model scenarios and find the best settings. Regularly test the water for chlorine levels and track performance. This helps you adjust your metering pump or solution strength for consistent results.

Optimizing your system lowers chemical use, reduces costs, and ensures clean, safe water, making your treatment process more efficient and sustainable.