Once I received it installation was obvious and needed no instructions, took about a minute or two. Be careful not to over tighten as these parts made of plastic and could break with too much pressure. I used the product for a shower and the result was immediately obvious as the chlorine smell was gone and the 2ater just felt like rain. I am Irish and my skin is always dry in the PA winters we have here, after getting a shower it's quite miserable due to the chlorine and humidity.  After the shower last night and now the next morning I have no dry skin and feel very good. This filter clearly is working.