I don't know squat about treating chlorinated or chloraminated water; this thread is making me even more thankful than I already was that I am on my own well. Please pardon the naive questions; I'm just trying to make sense of it.
So...is the ammonia in the chloramine accessible to nitrifying bacteria? If yes, then the ammonia being dripped into a system would be analogous to that produced by a larger bioload, wouldn't it? How does the added ammonia in chloraminated water dripping in compare to the added ammonia introduced by adding a couple big fish to the system? We don't measure any ammonia in healthy cycled tanks because it is used up as fast by the bacteria as it's produced by the fish. So if you are continuously dripping ammonia into the system, how is that different than adding more fish that would be continuously producing it? I'm not sure why one would expect to read ammonia in the tank, as long as the filter can handle that "artificial bioload"...which virtually all of them can, when we're just discussing bioloads.
Wouldn't the more troublesome aspect of chloramine be the chlorine component, which won't quickly dissipate the way chlorine alone would? My initial thought was that a "bio-pre-filter" could be set up that would utilize the ammonia in the tap water, converting it before the new water ever enters the tank...but then you still need to remove the chlorine which will interfere with such a filter.
Add in the numerous comments regarding how variable the dosing done by the municipal water supply can be and it really becomes worrisome. Way back when I was on municipal water, I recall how much variation was detectable day to day simply by smelling the water for chlorine; it sounds like this new chloramine bugaboo is just as inconsistent today as simple chlorine was 50 years ago.
Prime claims that it removes/detoxifies both components of chloramine. I seem to recall reading here on MFK that Prime is safe even when overdosed by a huge margin. Wouldn't the obvious and indeed only safe solution be to use an automatic dosing system to add a level of Prime sufficient to deal with even the highest expected levels of chloramine? Or would Prime become a problem in its own right if the fish are exposed to it continuously instead of just once a week or so during water changes?
I'm following closely to see how
Egon
and
wednesday13
and others deal with this.