How they work
A swim current machine pushes a steady stream of water so you can swim in place against it — the same idea as a dedicated endless pool, but as an add-on to the pool you already have, for a fraction of the cost.
Above-ground and frame pools
For frame and above-ground pools, a clip-on unit around 1,500 GPM creates a comfortable training current without any construction. It's the easiest way to add lap-style exercise to a backyard pool.
In-ground pools and serious swimmers
In-ground owners who want a stronger, adjustable current should step up to a ~3,000 GPM unit. Double the flow means a tougher resistance swim for endurance training and low-impact workouts.