How does pet waste enzyme activity affect the surface texture of stone outdoor bins?

Pet waste contains potent digestive enzymes, primarily proteases and lipases, that actively break down organic matter. When deposited in stone outdoor bins, these enzymes don't simply clean surfaces - they initiate chemical reactions with mineral components in natural stone. Over repeated exposure, the enzymatic activity accelerates the dissolution of calcite in marble and limestone, while simultaneously weakening the silicate bonds in granite. This biochemical degradation manifests as surface pitting, roughness, and loss of structural integrity. The porous nature of most stone materials allows enzyme penetration, creating subsurface erosion that worsens with weathering. Research indicates that urea present in pet waste further compounds this damage by creating alkaline conditions that amplify enzymatic efficiency. Regular cleaning with pH-neutral solutions and application of stone sealants can create protective barriers against these enzymatic attacks, preserving both the aesthetic appeal and functional durability of outdoor stone bins.