I have a double handle delta shower. The cold water side has very low pressure so I removed the cartridge and made sure there was no build-up there. It was fine. How can I check and clear any build up further down the cold water inlet? Can a 'snake' of some type be used? Added info here...our city water, while not hard, has a habit of containing white particulate that ranges from fine sand size to half little fingernail size. I clean it out of the filter for the washer cold water inlet at least once a month or so. That's why I think there is a build up somewhere.