Foam & Algae After Pond Liner Repair

Pond leak repaired. Now heavy foam + algae. Foam not from organics (started after repair). Algae: strong green, covers stones in 2 days. 2 tbsp chlorine kills algae but more foam. No fish yet. Asks chemical treatment.

Foam Source: Repair Materials

Seam tape adhesive, liner cleaner residue, or lawn product runoff. Foam = surfactants.

Algae: Filamentous Green

Nutrients in water. Chlorine (bleach) works but adds foam (chloramines). No fish = can use bleach, but must fully drain/refill before stocking.

Real Fix

• Identify & remove foam source (flush, activated carbon).
• Nutrient control: water changes, plants, no fertilizer runoff.
• UV clarifier for ongoing algae prevention.
• No chemical "cure"—management only.

Foam + algae = new pond syndrome + contamination. Clean start needed.