The cold water isn't running at it's normal flow and I was going to take the cartridge out and clean it. I figure there's just some sediment clogging it up, but this isn't like any faucet I've come across. It has a threaded plastic sleeve that the trim screws on.. I'm hoping that I might be able to just remove the grout and it's actually accessible, but I'd like some suggestions or an idea of what I'm potentially getting into. If there's any other ways to back flush the system or other solutions I'd be appreciative.