The Honest Truth About Variable Speed Pumps
Variable speed pool pumps have become the default choice for many pool owners and pool service pros, and the energy savings are real. But once you move from a single speed pump running around 3450 RPM to a variable speed pump cruising at 1800 to 2400 RPM, the pool simply behaves differently. The first surprise is surface velocity: the top of the water does not “pull” debris toward the skimmer the same way, so leaves and bugs can linger longer. That isn’t a failure of circulation so much as a change in flow dynamics, and it can show up fast on pools that relied on strong surface movement to keep the waterline clean. The next reality check is anything that depends on strong suction or high return flow. Automatic pool cleaners, especially suction cleaners, often won’t move well at low speed and may crawl across the floor instead of covering the pool efficiently. Many pools need 2600 RPM as a practical middle speed, and some setups require 2800 to 3000 RPM depending on plumbing ...