New Koi Pond: Tap Water Prep, Filtration, and Stocking

Filling a 15,000-Gal Koi Pond with Tap Water

Never add fish to fresh tap water. Let it sit 3–7 days (or dechlorinate) to off-gas chlorine/chloramine. Splash fill to aerate.

Test pH, hardness, alkalinity.
Adjust if extreme before stocking.
"Murky is better for fish" — true biologically, but clear lets you monitor health.

1000 gal for first koi + 100 gal each additional. 15,000 gal = ~140 koi max, but start with 10–20 and grow slowly.

Essential. Bottom drains, skimmer, biofilter, UV. Size for total volume + fish load.

Don't rush. Cycle the pond (4–6 weeks) before adding expensive koi.

Pond and Water Gardening: Winterizing a Koi Pond in North Carolina; Koi Behavior in Cold Water: Surface Hovering; Black Water in a Koi Pond: Test pH and Nitrite First; Restoring a 1,000-Gal Pond Dominated by 24-Year-Old Carp; Chlorine Overdose from Forgotten Hose: Saving Koi; Foam Around Pond Edges After Algaecide: Overdose or Surfactant?; New Pond Owner Loses Koi: Common Mistakes and How to Avoid Them; Koi with Large Body Holes: Disease, Toxins, or Cement Pond Issues?; High Altitude Koi Pond: pH Obsession vs. Nutrient Control; New Koi Floating Upside Down: Shock, Chlorine, or Disease?

Garden Articles

Plants