Shock chlorination is the most effective way to eliminate these bacteria. Wells should be shock chlorinated when a well water sample result shows that there is bacteria in the water. Any time a well is opened for repair it must be disinfected.
Some water filters, such as carbon filters, should be temporarily disconnected or by-passed during shock chlorination. Check owner's manuals or manufacturers' literature before shock chlorinating to avoid damage to components. Use liquid household bleach containing 5. Do not use bleach with a "fresh scent," lemon fragrance, or other cleaners added.
One gallon of bleach will treat up to an 8-inch diameter well containing feet of water. If your well is much larger, or if your distribution system is unusually large, expect to use more than 1 gallon of bleach.
Avoid direct skin contact with bleach solutions. Wear rubber gloves, goggles, and a chemical-resistant apron when handling bleach. If it accidentally gets on your skin, flush immediately with clean water. Never mix chlorine bleach with other cleaners; it may produce a toxic gas. Some chlorine may persist in the system for days. Water with a slight chlorine smell should be usable for most purposes. If the odor or taste is objectionable, simply let the water run until the chlorine dissipates.
If the test results show the absence of coliform bacteria, the water is safe to drink. When using ordinary laundry bleach, 3 pints should be added for every gallons of water in the well. To determine the amount of standing water in your well, follow the steps below. If the depth of the water in the well is unknown, use a volume of bleach equal to two times the ft water depth for the appropriate casing diameter. For example, an 8-inch casing diameter with ft water depth would require 1.
If the water depth is unknown, the required amount of bleach will be 1. Do not use bleach in excess of the recommended amount because it is not necessary and will require additional flushing before household use.
Well Chlorination in Arsenic Sensitive Areas. Classes, Workshops, and Club Meetings UGA Extension offers a wealth of personalized services like workshops, classes, consultation, certifications, camps, and educator resources. Your local Watermaster can help you get a copy of your well log. Your well driller may also have this information. Use plain liquid laundry bleach Chlorox, Purex, or a generic brand.
Do not use bleach with additives or special scents. Use 2 cups or less per 2 gallon bucket of water. Straight chlorine can corrode metal well parts. Pour the diluted chlorine bleach solution down the well.
Be careful not to splash on clothes or skin. Mix the chlorine and well water. Attach a hose to a faucet near the well and run the water. After you smell chlorine, direct the water from the hose back down into the top of the well if you don't smell chlorine after a few minutes, add some more before circulating the water. Make sure the system is chlorinated by opening each fixture sink, shower, outdoor faucet, etc.
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