Hey there, I am sorry to hear about your experience with one of our Orbit Cobra Mistands. We have a filter that can try to help with that called the Calcium Inhibitor filter and that can be found on Orbitonline.com. Our Orbit support team is also happy to help with any questions and concerns you have and can be reached by phone at (800) 488-6156 or online at support.orbitonline.com. Have a great rest of your day.