The number of ampules needed to re-chlorinate a 400-gallon water trailer depends on the concentration of the chlorination product and the desired chlorine level in the water. Typically, a common recommendation is to achieve a chlorine concentration of 2-5 mg/L. Check the product instructions for the specific ampule dosage per gallon to calculate the total required based on your target concentration. Always follow the manufacturer's guidelines for safe and effective chlorination.
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