Domt use black perf it will fail eventually. Use sdr35 that's perf or some other hard pipe. If you have groundwater all the time liner swaps are a challenge. With a working collar drain you will never have liner float. If I have any groundwater issues I automatically add a sump pit to make my life easier and it benefits them later. Sometimes a collar drain too. My personal pool has 3 sumps amd collar drainage. It's pretty easy to do now its expensive and invasive to do it later