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Module 6 — Shock Chlorination
Siphon or drain this solution slowly into the well (see Figure 2, Siphoning
Chlorine Solution).
Open each hydrant and faucet in the distribution system (including all appliances
that use water such as dishwasher, washing machine, furnace humidifier) until the
water coming out has a chlorine odour. This will ensure all the plumbing fixtures are
chlorinated. Allow the hot water tank to fill completely. Consult your water treatment
equipment supplier to find out if any part of your water treatment system should be
bypassed, to prevent damage.
Leave the chlorine solution in the well and distribution system for 8 to 48 hours.
The longer the contact time, the better the results.
Open an outside tap and allow the water to run until the chlorine odour is greatly
reduced. Make sure to direct the water away from sensitive plants or landscaping.
Do not over-pump your well.
Flush the chlorine solution from the hot water heater and household distribution
system. The small amount of chlorine in the distribution system will not harm the
septic tank.
Backwash and regenerate any water treatment equipment.
If you have an old well that has not been routinely chlorinated, consider hiring a
licensed water well contractor to thoroughly clean the well prior to chlorinating. Any floating
debris should be removed from the well and the casing should be scrubbed to disturb the
sludge buildup.
Step 9
Step 8
Step 7
Step 6
Step 5
Step 4
Figure 2 Siphoning Chlorine Solution