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I just leave my water in gallon jugs for a day or so. By that time all the chlorine has escaped...
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Chloramine won't evaporate though...
For most species, it doesn't matter much. Floride and chloramine and heavy metals won't do much to the majority of reptiles... Amphibians should be treated like fish and have the nastier things removed, some reptiles fall into this category as well but they're a minority... chams and the like.
I was actually looking at some of what I use for the hellbenders... I paid $1.99 for a two ounce bottle of Mardel Lab's dechlorinator (also detoxifies heavy metals and breaks the ammonia bond in chloramine). It's used in a concentration of one drop per gallon of water, the bottle I have should treat something like 12,000 gallons (estimate of course). The standard reptisafe small bottle is 2.25 ounces and is about three dollars... it's two drops per ounce of water or about three teaspoons per gallon. A quick google search indicated that (varying slightly with liquid density of course) a teaspoon is somewhere between 60 and 100 drops. So call it about 240 drops per gallon of water which needs to be treated, using an average of the drops per teaspoon measurements that I got.
So one third more expensive (volume) and 1/240th as effective, making it well over three HUNDRED fifty times as expensive to actually use for animals. Ouch.