Product review (5 stars): This is a must for anyone using an evaporative cooler.
We own a Luma evaporative cooler.  They water inside the unit got very "slimy" over time.  I'm not even sure what was growing.  Once I started using this product the slim was gone.  Now I'm afraid to run the unit without it.  Works as advertised.  A little goes a long way to prevent strange things from growing in your evaporative cooler.