The pipes are rated for X amount of static pressure against them - the same pressure that will be inside the piping when all faucets are closed and the pressure is sitting there so I would set the pressure with all faucets closed and the water on. Tryin go set the pressure while the water is running will give you a false setting.
Edit: my regulator is set at 40psi and seems to be adequate.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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