Spring Maintenance for a Neglected Koi Pond: Water Top‑Up, Debris Removal, and Feeding

Situation

Renter in Long Island, NY, inherited a ~1,800‑gallon pond with 15 koi. Pond froze solid, water dropped 2 ft, leaves/twigs at bottom. Landlord claims “no maintenance needed.”

Immediate Steps

• Top up with tap water + dechlorinator – Chlorine burns gills; treat any addition >10% volume.
• Remove debris – Net leaves/twigs; decaying organics fuel ammonia and algae.
• Start feeding – Koi need quality food (spring pellets, Cheerios, varied diet).

Ongoing Care

• Test pH, ammonia, nitrite weekly.
• Add beneficial bacteria (Microbe‑Lift, BZT).
• Pond salt (if plants tolerate), baking soda (for soft water), barley straw (algae).
• Consider Koi‑Zyme in spring for Aeromonas prevention.

Stocking Reality Check

15 koi in ~1,800 gallons is heavy (experts: 1,000 gal + 100 gal/koi). Plan for future upgrades or rehoming.

Winter Prep

See winterizing guide for next year.