Once in a while we are stuck with tap water which is needed in a tank and we know there are chloramines in it. (Yeah, a carbon filter on a slow flowing drinking quality hose would be best, but how many of us have that just lying around in the garage?)
Or a tank is getting really funky, our schedule is suddenly intense and we don't want to lose old friends in a tank.
An expensive quick fix in a tank with too much ammonia in it is to buy the very expensive Polyfilter and (cut to size) insert it in your power (or other) filter. When it turns dark brown from it's almost white, it is used up. (I keep them as algae scrubbers when tearing down and cleaning a tank outside.)
I believe there are other ammonia ion exchangers in bags and crystals. I'm sure your LFS people could tell your more.
Those Polyfilters are even chemically active just sitting there. They have always stored well in the bag they are sold in. However I picked up one in a fishbag at an auction. The price was right and it looked new and ready to go.
My mistake was leaving it in the semi-permeable fish bag. (They do allow some oxygen and carbon dioxide exchange through the plastic.) In time the polyfilter in the fish bag turned brown. The fish room sure smelled even nicer though! ;)
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