10% twice a week (≈40 gal each) is safer than 25% once. Splash the water in (spray nozzle, waterfall) to off-gas chlorine/chloramine before it hits the biofilter.
If your municipal water uses chloramine (doesn't off-gas), you must use dechlorinator. Test with a chlorine test strip.
Splashing dissipates chlorine; trickling does not. Never run chlorinated water directly into a biofilter.
Bubbles on Pond Surface After Refill: Normal Physics, Not a Problem
Orange-Brown Pond Water: Solving Tannin & Sediment Issues
Fastest Way to Drain a Vandalized Pond for Cleanup
Clearing Murky Pond Water: Sand Filter Conversion & Fish Selection
Winterizing a Shallow Multi-Level Pond in Zone 5
Lowering Pond pH with Muriatic Acid: Concrete Pond Solutions
Adding Fish to a Rain-Fed Frog Pond: Filter and Species Advice
Persistent Murky Water in a 3000-Gallon Pond with Bog Filter
Scale on Pond Rocks and Yellow Surface Film: Organic Buildup and Bacterial Clarifiers
Unlined Pond with Tea-Colored Water: Why It Never Clears
Controlling Algae in a Small Pond with Goldfish and Mosquito Fish
Algae Control Without Plants: Dealing with a Plant‑Eating Groundhog
Maintaining Alkalinity in a 3,500‑Gallon Pond with Baking Soda
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