Why would anyone want to inject chemicals before the pump??
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Usually it’s to apply soap at high pressure for washing trucks.
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better control over the chem vs water mix.
Better control? I don’t know anything about an upstream injector. Just seams like it would damage the pump if you put SH through it
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It will damage the pump but you will have exact control over the concentration in your mix, making it dummy proof when you have employees. Also give you the option to wash roofs with the same machine you wash houses with. To me, the disadvantages outweigh the advantages but I know some people who make a ton of money running their rigs like that
