Quick Fix for String Algae: Manual Removal, Algaecide, and Biofiltration

Immediate Removal

Net out as much string algae as possible.

Apply a pond-safe algaecide per label. It clumps remaining algae for easier netting. Repeat 3–4 times over two weeks.

Build a biological filter (see DIY biofilter article). It consumes the nutrients algae need.

Why now? More sun (tree removal)? Fewer plants? More fish? Address the root cause.

Pond and Water Gardening: Pond Liner vs. Concrete: Which to Choose?; Clearing Green Water in a Fishless Pond; Fixing a Murky Concrete Pond Without Fish; Restoring a Neglected Backyard Pond for Safe Swimming; pH Adjustment for Fish Transfer: Raise Old Pond, Not Lower New; Overwintering Pond Goldfish: When to Bring Them Inside; Pond Volume & Pump Size Calculator; Seaming Two Pond Liners at a Waterfall: Step-by-Step for a Leak-Proof Join; Eliminating Blanket Weed (String Algae): Nitrogen Control, Shade, and Treatments; Quick Fix for String Algae: Manual Removal, Algaecide, and Biofiltration

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