Reach-iT FLOW GUAGE
This guage is ideal to upgrade FLOW - it has both Temperature and Pressure for you to understand the working conditions at the Spigot.
By switching FLOW to OFF, you can measure the water pressure at spigot.
By switching FLOW to ON, you can measure the operating pressure.
Temperature seriously affects the performance of all RO MEMBRANES - with inlet water temperature at 75 degrees F (Factory rating conditions)(25C), an RO performs DOUBLE the pure water production compared to when inlet water temperature is 39 degrees F (6C).
This is particularly important when starting again in Spring, when the ground temperature might be close to 30 degrees (and our water supply comes from underground), even if the nice Spring day is 60 degrees.
If applicable where you live, overcome this issue with a BOOSTER PUMP.