The way it's worded, it sounds like the new water is only neutralized for 24 hours. Other replies said that they needed to figure out the source of the high ammonia, not just use the conditioner.
It probably means that you need to either cycle your tank or do frequent water changes to keep the ammonia down. The general idea in the entire thread seemed to be that water conditioner alone is not enough to get rid of the ammonia.
It doesn't seem to be a very common concern because I can't find much information on it.