Ive tried adding a terrain below it but that doesnt seem to help
Hello ,
Thank you for contacting us regarding this issue you are facing and it seems like you need to add a plane to the top surface of your pool in order to represent the top of the water. You are currently applying the water material to the bottom of the pool. So the elements below the surface show up. Hope this makes sense and let me know if you need further help.
For reference here are some videos I found that will help you:
https://youtu.be/k3hcWvfWKV0
https://youtu.be/AqcP1kc3ZzY
Kind regards,
Vincent B.