Have you tried any other pump systems while swimming? Not every system is perfect for every person.
Some people use a long-acting pen (Tresiba, Levemir, Tujeo) for basal and a tubed pump for bolus and corrections. When they swim, they take the pump off, leaving only an infusion site small plastic hub on the skin. Basal is mostly covered by the long acting pen shot with minimal pump basal to keep the site kinetics active.
It's a little more complicated but versatile and well-suited for frequent swim sessions. This system also provides an extra layer of safety against DKA since the basal is provided separately and is not subject to the vagaries of failed site absorption, a real risk for pumping only. Silent occlusions affect pumpers regularly.