Mya: real beauty page minoxidil 5 precio farmacia Part of the danger is how swimmers can disappear under the surface. Even in a clear pool, a swimmer’s movement can blur their presence. In a murky water pond, it’s even more dramatic. But the Wahooo system also helps lifeguards locate a downed swimmer, using a tracking device. Before, the best way to find a lost swimmer was to form a rescue line, sweeping the area step-by-step.