Last week the PF/2 Energizer product exploded and broke our toilet tank. Has this happened to anyone else? The top of the tank blew off/ the front half of the tank busted. This could have potentially injured someone. We have lived in our home for 8 years and never experienced anything like this. The customer service line only allowed me to leave a message so I'm looking for ideas on why this might have happened. Has anyone heard of this happening?