Ive been actively trying to figure that out all winter... I finally found the answer...
https://photos.app.goo.gl/wHGYiQunpzzH7PNr5
I bought it more for partial draining and removing some of the dirt particles from the bottom of the tub, but no reason it shouldnt work in reverse as well
https://photos.app.goo.gl/wHGYiQunpzzH7PNr5
I bought it more for partial draining and removing some of the dirt particles from the bottom of the tub, but no reason it shouldnt work in reverse as well