White Foam in New Pondless Waterfall: Construction Residues

New pondless waterfall (2-tier, birdbath basin, underground reservoir) has white sudsy foam in basin. No soap, fish, or plants. Owner asks cause and defoamers.

Sources of Foam

• Dirty liner/rocks (manufacturing dust).
• Waterfall foam sealant overspray.
• Pump lubricant.
• Birdbath finish leachates.

Resolution

• Foam dissipates in weeks as residues flush out.
• Refill with fresh water to accelerate.
• Defoamers (“Foam Away”, “No More Foam”) work temporarily.
• No long-term risk; purely cosmetic.

It’s a new-feature phenomenon. Patience beats chemicals.