Sport
Swimming is mentioned in the sources as one of the activities that supports stamina. There is no separate guidance on how to fix the sensor in the water, or on sensor water resistance, in the sources.
Source: Diabetesliitto
Source: Terveyskylä
Source: Diabetesliitto
The sources do not include manufacturer- or device-specific guidance. Check the user manual for your own sensor.
Sources: diabetes.fi (Diabetesliitto, the Finnish Diabetes Association) and terveyskyla.fi (Diabetestalo / Lastentalo). This app does not replace the individual instructions you receive from your clinic. Insulin doses, correction factors and sick-day rules are always agreed with your own care team.