Yes, you can. Once the Swim Jet is set up on Wi-Fi for the first time, you can control it through Bluetooth even without an internet connection. Just keep in mind that certain features, like firmware updates, will still need internet access.
Yes, multiple people can connect to the same Swim Jet. In the app, the main account holder (administrator) can simply go to Device Details → Equipment Details → Share Equipment to give access to family members or other users.
With the iGarden App, you can easily control your Swim Jet right from your phone. You’ll be able to turn it on or off, change modes, adjust the water flow speed, and set timers so it runs when you want.