u/BillieParamore

I don't know where to ask this and I know there are pros here.

So I am trying to remove this paint from my pool. Dark blue is the last coat before plaster. I removed the light blue with my 1700 psi pressure washer but I had to hold it 1 cm above the surface. So my question is: how powerful a pressure washer do I need to remove it all without having to remove inch by inch? 4000psi, 10000psi? Thanks for any help.