I have a major problem with this because they make no mention or disclaimer on the FAQ under Fish Tanks that their filters do not fully prepare the water for aquarium use (meaning that the filter does not fully remove chlorine/chloramines)

Pur Website FAQ

I hope they mean that it is safe to use for fish tanks, not necessarily that it may not need things like dechlorinator.

I personally use BRITA filtered water on my fish tank in San Diego. However, this is because the water here is kind of nasty and I still add things like dechlorinator and salt.