Running hot water through the filter will decrease the effectiveness of the filter.
Yes, for faucet mounts run cold water for 5 minutes in the filtered position upon first use.
Replacing the filter is easy. Simply twist off the top cover, remove the old filter, put in the new one, and replace the top cover. Also, it is important to run cold water through the filter for five minutes before use.
PUR faucet mount systems are certified by NSF International to reduce 72 contaminants and substances, including sediment, chlorine (taste and odor) and its by-products, which is more than any other brand.