Instruct: Classify the given review into positive or negative sentiment.
Query: Called Procter & Gamble about the missing Monitor feature

First off, I want to thank all the reviewers for having called to our attention the missing monitor feature on the new version of this filter.Like many others, the advice of replacing the filter every "one or two months" is of little help--our use varies greatly. These filters are not cheap!I called P&G;: they say the monitor was often inaccurate so it was removed. They stick to their "replace filter every one/two months." HOWEVER, they also say: "replace the filter when you notice it takes longer than usual to filter a pitcher's worth of water; the filter will not leach impurities, simply begin to clog up and take much longer to filter the water."Considered switching to Brita but PUR filters out many more impurities than Brita.