Uncrushed gravel, used for under-bedding on any water softeners that need to have a support media bed. Water softener gravel comes steam cleaned, however during shipping there may be a minimal amount of dust that collects on it, but it can be rinsed off during your water softener's backwashing cycle.
This gravel promotes good water flow and even water distribution through the under-bedding. It will maintain the quality of the treated water, specifically in softeners. Three inch layers are recommended in graded support beds.