Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Uses Replacement Filters that can't be bought

You can't buy replacement filters for this device. That is, purchase the same filter that you get with it new. Instead you're supposed to use the standard pitcher filters...which you need a special adapter to make it work.That is, a free adapter, that brita does not have in stock, and is backordered on for an indeterminate amount of time on. We've had two different conversion kits on backorder since may 05 (that's 4 months).Two E-mails to the website went unanswered. Phone calls to the "no customer service" desktop say "supervisors hope we'll have an answer to when we'll get them in in a couple weeks". And this is how a multinational company does products? Makes a product, changes the consumables type, and doesn't make enough conversion parts to supply existing products.