After research and calculations the plumbing upgrade begins. Currently the pool has 1.5 inch pipe and appears to have had multiple repairs. The pool currently has 3 returns 2 in deep end and the other appears as an old suction line that was converted to a return line. The pool has 1 skimmer and the main drain has been concreted over. A second skimmer will be added and would like to add 2 more return lines in the shallow end of pool. The plumbing will be replaced with 2 inch and run parallel. Valves will be added at the pool pad to separate the skimmers and return lines. A vs pump (not sure which pentair) and cartridge filter will be used.
Is a reducer used for the 2 to 1.5 existing return lines? Will this have significant pressure problems?
How are return lines added in a gunite pool? How large should the hole be? How to reseal the hole?
Anything I am missing?
Thank you for the help