The Krups Claris Aqua Filter is available at Amazon.com, Newegg and ThePartsBiz.com. The price of the filter, as of 2015, is about $20 on each site. All of the sites also provide a list of the Krups models that the filter fits.
Amazon.com provides information on products that other people purchased with the Krups Aqua Filter, such as cleaning tablets and de-scaling powder for Krups machines. Also, customers on Amazon rated the filter 4.2 out of 5 stars, with most saying that it works well with their machine. Newegg does not have any current customer reviews, but provides the link to the manufacturer's site and the support site for the filter. It also gives information on warranty and return policies. ThePartsBiz.com gives the least amount of information about the water filter, but does offer discounts, as of 2015, if purchasing more than one filter.
The Krups Aqua Filter is recommended to improve the quality of coffee made in a Krups machine. It filters out chlorine, lead, copper and other pesticides in the water using carbon and an anti-scaling substance. This also prevents mineral and lime scale build-up, which increases the life of the machine. The filter should be changed every two months for best results.