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My experiences with low flow at some or all faucets relates more to a volume problem, rather than pressure per se, and can be traced to accumulated flow restriction from one (or more) of the following:
(1) Crystallized pink anti-freeze in the aerators and nozzles. The solution is to disassemble and clean those parts that you can, and replace those that you can’t clean. Because of this tendency to crystallize, I remove all aerators and nozzles during winterization, and replace them after flushing in the spring;
(2) Use of an external pressure reducer/flow restrictor in addition to the city water pressure reducer (flow restrictor) typically installed at the trailer’s city water connection. Remove the external pressure reducer/flow restrictor;
(3) The presence of some other flow restrictor, perhaps a removable washer, sometimes found in some water fixtures. Remove any removable restrictor as these restrictions add up, and you simply run out of volume;
(4) A defective vacuum breaker where the shower hose enters the shower stall wall. Replace as needed;
(5) The city water hose bib is not fully on, turn it on full;
(6) Replace the shower wand head typically installed in most RV’s with an Oxygenics shower head. It won’t necessarily allow an increase in actual water flow, but it will magically blend water and air to give a satisfactory sensation of increased water pressure and soap removal.
Since most RV park and campground water supply lines are galvanized at the riser, I always turn the spigots on for a few seconds to discharge any loose particles. I use a single-stage filter at my city water connection, and at season’s end, I’ve never noticed any accumulated particles that would cause a flow problem. I have 85 psi at home, and I have experienced low flow issues inside my trailer, even at that pressure, generally at the shower or the kitchen. The solution has been one or more of the items above. In my experience, most parks/campgrounds have either satisfactory or low water pressure (just like electricity), but campground low pressure has never been a source of problems inside my trailer. I have never encountered high water pressure in my camping experiences in the west, and we typically use our Airstream about 50/nights per year, 98% of the time on hookups. If you have to turn on your pump to acquire satisfactory pressure inside, then something is wrong…either one or more of the things above, or a more serious problem like a kink or a leak. The latter should be obvious by now.
I hope this helps. Others may have encountered other common, solvable problem sources to investigate before tearing out walls.
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