Chemical injectors to hose

I added a chemical injector to my hose, now I have water back flow coming through my factory chemical injector, with lots of pressure and want surface cleaner want work being this way, did I miss something here. Help please.

Hello and welcome to the forum

You should take a moment to reflect on what you wrote. Some people my find it difficult to answer you based on how you wrote your question. This is also the busy time of the year for many members, and they may be more inclined to assist a new member if you include a photo of your particular issue(s). As surprising as it may sound, there are a lot of drive by members this time of year that can’t get something working and they want an immediate answer. Photos and descriptions of your unit would be beneficial.