This PHP Script has an Anti-Leech feature turned on.

Make sure you are accessing this file directly from www.steam-brite.com

It seems you are trying to get it from https://steam-brite.com/literature/schematics/index.php?dir=Pros+Choice%2F&file=Filtration_Soil_Remover.doc

Your IP address has been logged.
3.145.161.194 (ec2-3-145-161-194.us-east-2.compute.amazonaws.com)

Here is a link to the directory index the file is in:
http://www.steam-brite.com/literature/schematics/index.php?dir=Pros%20Choice/