A few years ago I was applying some granular STUFF
(not sure that remember the name)to my pond and I didn't have good enough eye protection. My house is less than 100 yards away. I ran to the house
got in the shower, held my eyes open under water for 20 minutes. The pain was still more than I could bear at this point I was screaming. My wife took me to the emergency room. I was afraid that I would be blind for life. Luckily the damage was not permanent but it could have been.
This is just my two cents worth on the fact that
you CANNOT BE TO CAREFUL when using chemicals.