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Despite what you might think, downstream injecting has nothing to do with diabetics on a fishing trip. No. Downstream injecting just means that you introduce an additional liquid, such as a detergent, into your power washer through an injector that is mounted after the pump into the high pressure line side. This is usually done in low pressure mode. If you want to do a little high pressure mode injecting in your power washer, you will need an injector designed to operate at high pressures. You'll be happy to know that some of these high pressure injectors can be temporarily installed on the end of your gun lance. (Oooh, baby!)