Koi Pond Pump Failure: Detection and Backup Systems

Protecting Koi When the Pump Fails

A pump failure cuts off filtration and aeration—koi can die in hours, especially in summer. Detection and backup are essential.

Why Pumps Matter

• Circulate water through biofilter (ammonia → nitrite → nitrate).
• Provide oxygen via waterfall/surface agitation.
• Prevent stagnation, stratification, and toxin buildup.

Simple Detection & Alarm

• Flow switch on return line → triggers alarm if flow stops.
• Current sensor on pump power cord → alerts on power loss.
• Smart plug with app notification (e.g., Kasa, Shelly).

Backup Systems

1. Battery-backed air pump: Auto-starts on power loss (e.g., PondMaster AP series).
2. Secondary pump on separate circuit: Small fountain or air pump.
3. Generator: Whole-house or portable with auto-transfer switch.
4. Solar aerator: Daytime backup only.

Best Practice

Combine alarm + battery air pump for immediate oxygen, giving you time to fix the primary pump.

See Power Outage Pond Care.