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KFG: Check the old thread I started on water changes. HenryC did an experiment and found chlorine levels remained high after spraying tap water into a container. The time it takes for chlorine to dissipate is related to water hardness characteristics (which I do not understand adequately to attempt to explain). There will be different results in soft water than in very hard water. So, it is important to understand your source water. I would suggest picking up a test kit for chlorine (not very expensive) and use it on a bucket (clean) of fresh tap water. Test every 30 minutes until there is no detectable chlorine. You will then know an important characteristic of your tap water ... chlorine retention. NOTE: How it works in your pond will differ, because the chlorine will oxidize organics, dissipating at a faster rate than in a clean bucket. Those organics include the skin, gills, and mucous layer of your koi.
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