I asked my plumber to check on why the water flow on our Oletto single- lever pull-out faucet was becoming increasingly slow when he came over to give us an estimate on replacing our kitchen sink. We thought our problem was in the pipes, but when he looked at the faucet he said the filter needed to be cleaned out, but that the the faucet was poorly so designed it is very difficult to clean out and would not recommend buying a Kraus faucet again. He did recommended replacing our sink with a Kraus sink, as he said they are one of the best stainless sinks on the market. One month later the faucet is slow again, so now we have to replace this 3 year old faucet with another brand he recommends.