OK guys...
I jumped the gun. Yes, remove the valves and separate them from the o-rings. Most of our customers around the country do not have the luxury of running purified water through their pumps. Most of the water around the country seems to be scale-forming. Therefore, leaving deposits on wetted components of pumps. Using a descaler on the plastic and stainless pieces was only a suggestion. (Toilet bowl cleaner is a descaler found commonly around the house or shop and is more mild than a commercial grade compound and less expensive, too!)
For GP's recommendation, please visit the following link:
(
http://generalpump.com/PDFs/TECHNICAL%20DATA/ServiceManual.pdf)
Thanks for your patience guys. After this post, I am not sure if this is an appropriate place to offer help or not.
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