MISSOULA, Mont. -

NBC Montana has a crew on the scene of an apparent HazMat spill near Spectrum Products.  

Our reporters there indicate crews are working to contain a spill of approximately 5,000 gallons.  But no one seems sure, yet, what the substance is.

We checked Spectrum's webpage and found the company "manufactures a broad array of affordable, state-of-the art, quality products; which are used in the construction, operation and maintenance of commercial swimming pools and spas."

We're waiting to hear from the incident commander about the extent and nature of the spill.