David Larson wrote:
Hello all,

My local water board informs me that the water out of my tap has 4 ppm of chlorine. I know this is
way too high, and it will be treated accordingly to make it safe.

My question is this - what exactly does chlorine do to koi? Yes, I know it kills them... but I want
to know what takes place inside the fish, chemically, that causes them to die?

The bigger issue aside from the possible toxicity to the fish is the
loss of your Biological filter. Chlorine is is used to kill bacteria.
Guess what is dealing with the waste products.

The amonia spike will do them in just as surely as the 4 ppm remeber
you are diluting that unless you are doing a total water change. So I
really don't think you are even going to hit that 1ppm level. But lower
doses will harm your bio filter.

--
JSin
Lost Generation Custom Tattoo
To reply Kill the idiot