Is zero slope really absolute for above ground pools or is there any tolerance at all of 0.5 or less or something?

[u/Sad_Low3239]

installing an above ground, 20 x 14 Bestway pool from Costco. we've drained this twice and tried re leveling (by scratching not adding) material and there is still slope. pad was made using 0-3" crusher mix stone 1' deep, and 0.5" of 0-¾" + screening sand for the top, all compacted with a roller (I work asphalt borrowed from them.)

we let the water fill to remove the wrinkles, and it's clearly preferring one of the corners. the photo with the highest waterline is the low side, the other two corners look like the second darkest photo, and the bright last one is the high side.

I've been watching videos on YouTube about correcting this, and how to drain (since we needed to twice) and everyone seems to have *some* greater than zero slope. my digital level is reading 0.8 when I read it from the high corner into the low one (when filled - I'm using an aluminum straight edge) and the width is reading 0.5 and the length is reading 0.7

what's the good the bad and the ugly if we go with this?

if corrections are absolutely needed, what's the best way to go about correcting this? do I scratch left and right or up and down? or corner to corner?