Pump boxes often show maximum flow at zero head, which rarely reflects real installations. Proper sizing needs your actual lift and pipe path.
Three key inputs
- Total pond volume
- Desired turnover target
- Static head plus pipe and fitting resistance
How to choose confidently
Read the manufacturer flow curve and find your expected flow at your real head height. A controllable, slightly oversized pump is usually safer than an undersized fixed unit.
Common sizing mistakes
- Ignoring elbows, UV units, and long pipe runs
- Using only box headline flow numbers
- Designing with no allowance for seasonal fouling
Related reading and support
See Ponds & Koi and post your volume, lift, and plumbing route in Ponds & Koi forum.