White Foam at Waterfall: High Phosphates from Water Supply

Windsor, Ont. White foam at waterfall top. Asks cause, prevention.

Cause: Phosphates in Source Water

Municipal water often adds phosphates to prevent pipe corrosion/algae in drinking supply. Foam = phosphates + agitation.

Prevention

• No easy fix — it's in the water supply.
• Phosphate remover in filter (e.g., PhosBan) helps.
• Water changes with RO/DI water reduces but costly.
• Foam is cosmetic — not harmful to fish.

If persistent, test phosphate, use remover.