I think the water utility usually puts either chlorine or chloramines but not both?I dont have a definate answer for you but in a 1000l storage tank with 2 airstones it takes 3 days at room temp for all traces of chlorine and chloramine to dissapear hope that helps.
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I think you'd be surprised how low of a concentration of Chloramine is considered bad. I dechlorinate even a cup of water if I'm topping up. Here's a really good article about the concentrations and how they impact salt water fish: http://www.reefkeeping.com/issues/2003-11/rhf/feature/. There's no reason for freshwater fish to be any less sensitive. Not dechlorinating, especially when dealing with Chloramine is just cruel to the fish.I feel if its an auto top off the amount of chlorine/chloramine is negligible. How many people treat the water they top their tanks off with? I don't know anyone who will treat a gallon or 2 going into an aquarium to top off the water. This of course is relative to the size of aquarium but so is evaporation. The amount of water used to top off a tank due to evaporation does not even remotely come close to enough chlorine/chloramine to be of any concern whatsoever. You can find the concentration from your local water supply report and then calculate the amount of water per day or week based on water removed from you ATO then take that amount and divide by the ratio of tank water to introduced water. 50 gal tank say 2 gal used in auto top off a week gives you a 25 to1 ratio. take the numbers from your water report and do the math. That's my opinion but I think sometimes people are over cautious which is a good thing but some thing need to be taken with a grain of salt and this is one of those things.
Dan
There is absolutely a big difference between the sensitivity in general between saltwater and freshwater fish. We are talking auto top off here using a regulated water source not super high concentrations to begin with and then diluted massively by the ratio of tank water to top off water... Sorry but I totally disagree here.I think you'd be surprised how low of a concentration of Chloramine is considered bad. I dechlorinate even a cup of water if I'm topping up. Here's a really good article about the concentrations and how they impact salt water fish: Chloramine and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com. There's no reason for freshwater fish to be any less sensitive. Not dechlorinating, especially when dealing with Chloramine is just cruel to the fish.
Thanks,
Harry
