PP fills up to the bottom of the window, somewhere between 4&5 gallons. I thought mine slowed down the tumbling a bit toward the end of the wash cycle,  but it could have been an illusion, a flashback to the reduced speeds in the vintage toploader permanent press cycles.

I would really appreciate learning if the wash speeds ARE indeed variable, because I honestly can't tell. For sure there are some slow half turns on the hand wash cycle, and some rapid hurling spins, and half turn whirls on others, but when the machine is simply tumbling regularly, it all looks the same to me on any of the cycles.  Is that the case?  The stingy manual says nothing about speed except for spinning. 

On The Perm Press, Delicate & Hand Wash, the water level sensor is deactivated. 

If one desires, lots & lots, of H20. One Finds, hitting the tub clean button, after, turning off the machine, and turning it back on, fills it 1/3 way up the door. It's mix of Both the Hot & Cold lines (although you could turn either off if you wanted). Once Complete, just press the power button, and turn it back on again. And select a cycle (without a water level sensor) and proceed from there. 

I'm starting to become more kind to the thought, of LG Machines. This the most simplest, water level control I've ever encountered. 

LG Machines, do calculate the amount of water in the drum, and once measured, use the same amount of water for the rinses as it did with the main wash. So, once you've got it filled to your desired amount your good.