How do you flush a well after shocking it?
Run an outside spigot onto ground that drains away from your septic system, your garden, and any pond or stream, until a residual test shows the disinfectant is gone. It usually takes a few hours. Keep the shock water out of the house drains: a septic system is a living thing and a tankful of disinfectant is hard on it.
Judge by a residual test, not by smell. Noses fatigue fast, and stopping the flush early puts disinfectant in your coffee. Once the outside spigot reads clean, run each indoor tap briefly to clear the branch lines, and clean faucet aerators, which trap dislodged debris.
Expect the water to look worse before better: dead biofilm and rust that the treatment stripped will slough out through the flush. That debris leaving the system is the point of the whole exercise.
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