Thanks for the AquaPlant aquatic plant id site "ewest"!

I have something that I've never seen in my pond and I've had it for over 20 years. From the pics on the link to the AquaPlant aquatic plant id site, I assume it may be "Common Salvinia" maybe?? It's taken over pretty bad this year. It's floating, not attached to anything nor does it have long roots or anything. The whole mess of it will shift to one side of the pond on a windy day, so I'm planning on scooping as much as I can out next time this happens. But in the meantime I'd like to know what it is and/or what I can do to get rid of it, so that it doesn't come back after I get it all out, or as much as I can anyway. Thanks in advance to anyone who has any advice! (See attached pics)

Attached Images
IMG_9795.JPG IMG_9796.JPG IMG_9792.JPG Screen Shot 2019-04-22 at 3.40.54 PM.png
Last edited by bobbyc; 04/22/19 03:47 PM.