May be diluted with one or two parts tap water.
If you prefer to lower your shipping cost, we offer OmniClean as a concentrate. The bottle comes one-quarter full. Dilute contents with tap water slowly, to avoid excessive foaming, to approximately one inch (three inches for the gallon size) from the opening, cap, and shake.
There is a thickening agent that tends to gel in the concentrate. If you dilute upon arrival, it will re-dissolve in a day or two. Using the product before the thickener has totally redissolved will not affect cleaning-performance.