I've been using Nitraban to treat my tap water regularly now and it's worked wonders however... I'm nearing the end of the bottle and I just found out, even after shaking, the last bit of liquid left in the bottle MAY NOT neutralize cholorine. Cleansed my betta bowl, refilled it, and treated the water. Left it to sit for awhile, put the betta in and he was acting odd. Tested and... Chlorine. Ripped open new bottle and we're all good (he's now playing with the airstone again) but had I gone to bed like I normally do after cleaning, he woulda been KIA. Just wanted to give everyone a headsup if they use it!