Quick update:
Finished filling today. And proof I'm an idiot. There's little grates on the side for where the filter hooks up. Yeah well smart person I am, forgot about those and didn't think about how they work. Well let me tell you.... they're holes with grates over them. This means when the water gets to them, THE WATER GOES OUT THEM!!! So now there's about 100 gallons of water on my lawn (not a big deal) but I had to scramble to plug them so I don't lose more water from the pool. My best solution? The filter it came with. It's not running, but I can only pray to every god the dog doesn't decide it's a chew toy and I wake up to another 500 gallons in the yard and an emptier pool. Oh also, all that water turned all the new dirt I put down to level everything in to mud. So now the far side has sunk in to the mud about 4". Not too happy about that since it's causing the frame to bend a bit because it's not a gradual slope, it just straight up drops 3" like half way around. So solution is going to be dig out the dry end and make it level again. Either that or I spend another $25 draining and filling it since I pay $5/1000gal. :/
Learn from my mistake! water goes through holes!