You can use lemon juice to dechlorinate in a pinch.
So if you have acid water loving fish it will work.
When I worked for a water facility, we had to drain a heavily chlorine disinfected coagulation basin into a local stream (the basin held couple hundred thousand gallons).
It was considered better for the environment (considering the type stream) to use ascorbic acid, and adjust the pH a few hundred yards after dechlorination just before the effluent entered the stream.
My job at the time was to continuously monitor dechlorinattion, flow, and pH by running back-n-forth between the 2 points testing every few minutes.
So if you have acid water loving fish it will work.
When I worked for a water facility, we had to drain a heavily chlorine disinfected coagulation basin into a local stream (the basin held couple hundred thousand gallons).
It was considered better for the environment (considering the type stream) to use ascorbic acid, and adjust the pH a few hundred yards after dechlorination just before the effluent entered the stream.
My job at the time was to continuously monitor dechlorinattion, flow, and pH by running back-n-forth between the 2 points testing every few minutes.