White Slime in Whiskey Barrel Water Lily Tub: Leaching or Biofilm?

Possible Causes

Barrel residues: Whiskey barrels may leach tannins, sulfur, or cleaning chemicals.
Zinc nails/hoops: Corroding metal fosters slime molds.
Lily introduction: Plant brought in bacteria/fungus.
Natural biofilm: New surfaces develop microbial slime that often resolves in weeks.

Wait 2–3 weeks; most slimes self-resolve.
If persistent, consult a water garden nursery for a targeted treatment (avoid broad algaecides).
Delay adding watercress until slime is gone.

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