So, I was at a local hobbiest house and they were giving me a tour of their system. The thing that they told me that surprised me the most was that they do not treat for chloramine in their tap water. According to them they drain the pond to the level they want to change then slowly add water back at a trickle and do not add anything to neutralize the chloramine. According to them if you add the water slow enough it will dissipate on its own and be safe for fish. I was looking at a 10k gallon pond with some high dollar sansai that they grew out from last year that supposedly had never had a drop of conditioner added to the water. I know the cost of the koi in the pond and was looking at a $10k filtration system running it so it surprised me that they would do something that seemed so reckless. Does anybody have experience NOT treating water containing CHLORAMINE? I know chlorine can gas off, but i have never heard the same for chloramine. Any experience to provide further data on this would be useful as i would love to make a flow through system on my pond, but am inhibited by my local tap water.