Not a bug/insect (Calcium Scale or Water Mold)

Found in swimming pools, hot tubs, and spas, primarily on walls, floors, and plumbing fixtures.

If mold: Consumes dead organic matter, skin cells, and bacteria. If scale: Accumulation of calcium minerals precipitated from water.

If scale: Precipitates onto surfaces when pH or alkalinity is high. If mold: Grows in colonies, often resembling tissue paper or mucous, floating in water or clinging to surfaces.

Risks: Can clog pool filters, damage heater elements, make surfaces rough/abrasive (scale), or create unsanitary swimming conditions (mold). Benefits: None in a pool environment.