I installed a new impeller kit last year and it has already broken off all of its blades. Everything went together just fine and looked correct. I took it apart and all the blades were still soft rubber so I can't figure out why it went out so soon. The original impeller lasted for 30 years. I'm buying a new one to install but just wanted to know if anyone would know why it went out so soon so the next impeller doesn't do the same. Thanks