How Submersible Garden Pumps Work: Float Switch Explained

I bought one of these pumps today to use the rain water I collect to wash my back yard down. It also saves me putting an outside tap in now or at least I'm hopeful of not needing one atm. LOL
Could u please tell me if it is ok to full immerse this type of pump with the electric cable under the water line? That scares the F outa me when I see that in this video??
Just found ur channel today so I sub'd and liked.
I would be ever so grateful if u could let me know if it is ok to allow my Parkside pump 400W Water barrel pump. It worries me seeing the electrical cable under water like that.
Thanks to anybody who could leave an answer to my worries concerning how deep I can let the pump into the water barrel..

Hi - we've just had a Titan 400w dirty water pump installed after some garden works we had done. However the automatic switch isn't coming on as, from what I can see, when the water level rises then switch doesn't title enough for the sensor ball inside the switch to move to the on point. Any advice on how we can better this?

Is there a rest button

Ano po ang purpose nang float switch sa submersible pump