Barnes Pool Pumps, SE Series

A pool pump is not a general water pump installed somewhere else. It runs in continuous recirculation, moves high flows against low head, and has to do it in chlorinated water for years. The Barnes SE series is built for that duty.

Why the discharge is larger than the suction

Note the connections: 1 1/2″ suction and 2 1/2″ discharge. The asymmetry is deliberate. The pump has to move a lot of volume against little resistance, and a wide discharge cuts friction loss exactly where flow is highest. Narrowing that line at installation throws away much of the performance you paid for.

Size by pool volume

The operating rule is turnover time: the whole pool volume should pass through the filter in one cycle, typically 6 to 8 hours. Divide the pool's litres by the target hours and you have the minimum flow. Power is chosen against that flow, not the other way round.

Oversizing is a common and expensive mistake: a pump that is too large pushes water through the filter faster than the medium can trap particles, so it filters worse and costs more to run.

Both models are single-phase at 220 V with a closed impeller.