I can only tell you what I know about my house plant and the root system can get massive, its such a beautiful tree but if I were you I would remove it, better to replace the tree than the pool. Maybe there is a way of saving it and moving it to another part of your yard.

We have one next to a slab, and it's roots lifted the slab. I'd pull it.

oh, so sad, I think it's Amate..... I hope you can move it

They grow very easily from cuttings so you can make some large cuttings from it and poison the stump.

The Schefflera actinopylla is a Florida Category I exotic pest plant and is on the do not plant list. You should pull it while you still can and don't plant it in another part of your yard. Goggle Florida exotic pest plants and you will be amazed at what is on the list.

Even in California they make thick surface roots. Plenty to stumble over besides what they do to foundations or pools.