If housings and fitting meet the Uniform Plumbing Code and ANSI/NSF standards they have a 125 psi working pressure and about 3 times that burst pressure. Vendors will tell you 60-80 psi for liability reasons. Membranes are easily capable of 150+ psi and if you have a quality system the other components will withstand that too with no issues. Been running 100 psi for 8 years and never isolate the water supply and never a drop spilled. Membranes love pressure.
I'm running a booster pump at 65psi, which gives me the 4:1 ratio that spectrapure recommends. If I crank the pressure up to 100, won't my ratio change? Would I need a new restrictor?

