Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Probably not that effective.

Ok so I have not been using the unit that these go with for too long, just got it today. But just based on my feeling of the product, I highly doubt that they are very effective in actually filtering anything other than lint or other large debris. Its a loose felt material on the outside. The inside of it feels to be some stiff plastic or thin metal of some sort to hold the shape, with some pieces of carbon or charcoal in there. There are not a lot of actual carbon or charcoal chunks like you would see in a brita filter, and they do not do anything but sit at the bottom of the "filter" so I honestly dont see how they could do anything. We have a brita filter on our sink, so when I fill the unit, I use that and will use the rest of the 4 filters I got for the unit, but do not believe I will be purchasing more.