This water filter is an on-tap version which is really the easiest water filtration system next to the carafe methods. The unit connects to the kitchen faucet with no/limited tools. To keep you from overloading the filter it comes with an LED that tells you when you need to change the filter.
The included filter needs to be replaced after 4 months or 100 gallons of usage.
Prices are from $25 - $40.
Reviews are mixed for the filter. Those dissatisfied with the unit complain that it does not kill bacteria and it is not as sturdy as they would like. Those who like it are please with its ease of use and the way it makes their water taste.