STERIS' Process LpH® st Sterile One Step Cleaner Disinfectant and the One Solution LpH st System™ Pre-measured WFI are the sterile versions of the LpH family of one-step, acidic phenolic cleaner/disinfectants made specifically for use on hard non-porous surfaces. The One Solution LpH st System Pre-measured WFI combines a sterile unit dose pouch with a gallon of USP Water For Injection (WFI). The LpH products are all made with the same acidic phenolic formulation, but are processed and packaged differently for specific applications. At a use-dilution rate of 1:256, the LpH products kill a broad spectrum of common bacteria without harming the surface. Formulated to maintain an acidic use-dilution pH of 2.6 - 3.0, they are ideal for use in a disinfectant rotation program with the Vesphene® alkaline family of products.