It had nothing to do with cold water, it started before I used cold water. I had about 11 valves sent to me in a little over a years time. They would all freeze making it hard to push and Leak.I have amazing soft water system,so no harsh water was ever used. I cleaned it consistently with there cleaning products and recommendations , took the valves and caps cleaned it, even the spring, Nothing solved it. I enjoy the convenience of the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]bathmate[/words] and for the most part had great customer services and hope get another someday but with all the issues with the valves, then told they weren't responsible for it being lost when sent back, it didn't have tracking or insurance number for me that I was SOL.