One faucet in my main bathroom clogged shortly after installation.  I can't figure out how to remove the aerator to clean it so I looked at all of the documentation online and even called customer service.  The written documentation provided no instructions on how to remove the aerator so I called customer service.  The CS person was not helpful at all.  She offered to send me a new aerator but couldn't figure out how to remove the existing one.  This is a very poor design and as a result of their lack of assistance or instruction, I won't be purchasing any more Delta products.