Until now I have done over 50 km swimming in a pool of 10 meters.
I set set Pool size to 20 metres and after training I manually correckt the distance..
The recognation of my Garmin Watches works very well.
I have done with Fenix 3, Fenix 5S, Forerunner 935, Forerunner 945.
But until now it s still not possible to set the Pool size to 10 meters.
Please please Garmin change set allowed settings !!!
I cant build a larger Pool ;-))