Different company, and different equipment, but we had the plastic connection from the incoming water line SPLIT where it screwed into the mating connector for the water softener/whole house filter. Luckily I was in the garage when it happened and was able to turn off the water quickly. When the plumber came out to repair (same company, different tech) he stated the original installation was bad, and that METAL reinforced connections need to be made at these screw connections. He replaced all four connections, and 2 broke as he was replacing them!
Your original note stated the CASING failed, which would be a different problem, but I thought this info might be helpful.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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