What about chlorine in the water?

What about chlorine in the water?

Chlorine is added to all city water. Chlorine can be very toxic to koi. It can burn their
gills and can cause death. Chlorine evaporates rather easily so adding small amounts
of city water through an auto fill, for instance or through a very slow flowing drip line
usually does not present a problem. On the other hand, if you change more than a
couple inches of the water at one time you should take steps to either remove the
chlorine from the fill water before it reaches the pond or neutralize it once it enters the
pond. The most common way to solve this problem is to simply add some dechlorinator
(sodium thiosulfate) to the pond before you add the fill water. Another solution is to
install a carbon filter to the fill water line. A good quality carbon filter will automatically
remove all chlorine from the water before it reaches the pond. This is a great solution
but you need to make sure you change the carbon in the filter on a regular basis.
(see carbon filter at sacramentokoi.com)

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