Where does my water pressure actually come from?

One of three places, and which one decides everything else. Gravity from a tank above the house, where the pressure depends almost entirely on how high the tank sits. A pump, from a cistern or a deep well, where it depends on the pump. Or the mains directly, which in much of Central Luzon is weak by the time it reaches a tap on the second floor. Work out which you have before changing anything, because the fixes do not overlap.

How much pressure does a roof tank actually give?

Roughly 0.1 bar for every metre of height between the bottom of the tank and the tap. So a tank whose base sits three metres above your shower head gives about 0.3 bar, which is enough to fill a pail comfortably and not enough for a shower that feels strong. That is the arithmetic, and it is why raising a tank by a metre is noticeable and repainting it is not.

Why is there no screw to adjust on my system?

Because you probably have no pressure-reducing valve. Guides that tell you to turn a small screw clockwise are describing a regulator fitted to a pressurised mains supply, which is normal in the United States and uncommon here. If you have gravity or a pump, the pressure is set by height or by the pump, and there is nothing on the pipe to turn. Turning a fitting that merely looks like one usually produces a leak.

Only the shower is weak. Everything else is fine.

Then it is almost certainly the shower head, not the pressure. Mineral scale blocks the small holes from the inside and it happens gradually enough that nobody notices until it is bad. Unscrew it, soak it overnight in vinegar, and clear the holes with a pin. Same for a tap that has gone weak on its own: the aerator on the end unscrews and is usually full of grit.

Weak taps and a shower you can barely feel

Which outlets are weak, and whether it changed recently, tells you nearly everything. Start there rather than with a pump.

Call 0920 960 0596 Water line work

There is no screw to turn

Almost every guide to this tells you to adjust the pressure-reducing valve. Lowes says it plainly: turn the small screw on top clockwise. That advice describes a regulator fitted to a pressurised mains supply, which is standard in the United States.

Most homes here do not have one. If your water comes by gravity from a tank on the roof, or from a pump, the pressure is set by the height of that tank or by that pump, and there is no regulator on the pipe at all. Turning a fitting that merely looks like one is how people turn a pressure problem into a leak.

Which of these is yours

One outlet is weak, the rest are fine

The shower head or the tap aerator, blocked with scale or grit. The cheapest and most common cause, and you can fix it tonight with vinegar and a pin.

The whole house is weak, and always has been

The design rather than a fault. A tank too low, a pump too small, or supply pipe too narrow for the run. Nothing is broken, so nothing will be fixed by cleaning: it wants changing.

The whole house is weak and it got worse recently

Something changed. A partly closed valve after work was done, scale narrowing an old galvanised line, a failing pump, or a leak between the meter and the house taking the pressure before it arrives.

It is weak only at certain hours

The supply, not your plumbing. Shared mains pressure drops when a whole barangay showers. A tank that fills overnight is the usual answer, and it is a change to the house rather than a repair.

It is weak upstairs and fine downstairs

Normal, and it is the height doing it. Every metre up costs you about 0.1 bar. If the tank is barely above the upstairs shower there is almost nothing left by the time the water arrives.

What you can do tonight

Unscrew the shower head and soak it overnight in vinegar. Clear the holes with a pin from the inside out. This fixes more weak showers than anything else on this page.
Unscrew the aerator from the end of a weak gripo and rinse the gauze. It will usually be full of grit and scale.
Check every valve you can find is fully open, at the meter, at the tank and under the sink. A valve left three-quarters closed after other work is a common and invisible cause.
Look at the tank. If it is lower than the highest outlet it feeds, it can never deliver good pressure there, and no cleaning will change that.

Where it becomes somebody else's job

A pump that runs constantly, cuts in and out rapidly, or will not start. Rapid cycling is usually a pressure tank that has lost its air charge.
Anything electrical about the pump: the switch, the wiring, a breaker that trips when it starts. That is an electrician's work, not a plumber's, and it is worth saying rather than letting somebody poke at it.
Pressure that fell suddenly with no work done and no obvious cause, which often means a leak upstream taking it before it reaches you.
Old galvanised pipe narrowed by scale, which is replaced rather than cleared.

Questions about weak water pressure

Where does my water pressure actually come from?: One of three places, and which one decides everything else. Gravity from a tank above the house, where the pressure depends almost entirely on how high the tank sits. A pump, from a cistern or a deep well, where it depends on the pump. Or the mains directly, which in much of Central Luzon is weak by the time it reaches a tap on the second floor. Work out which you have before changing anything, because the fixes do not overlap.
How much pressure does a roof tank actually give?: Roughly 0.1 bar for every metre of height between the bottom of the tank and the tap. So a tank whose base sits three metres above your shower head gives about 0.3 bar, which is enough to fill a pail comfortably and not enough for a shower that feels strong. That is the arithmetic, and it is why raising a tank by a metre is noticeable and repainting it is not.
Why is there no screw to adjust on my system?: Because you probably have no pressure-reducing valve. Guides that tell you to turn a small screw clockwise are describing a regulator fitted to a pressurised mains supply, which is normal in the United States and uncommon here. If you have gravity or a pump, the pressure is set by height or by the pump, and there is nothing on the pipe to turn. Turning a fitting that merely looks like one usually produces a leak.
Only the shower is weak. Everything else is fine.: Then it is almost certainly the shower head, not the pressure. Mineral scale blocks the small holes from the inside and it happens gradually enough that nobody notices until it is bad. Unscrew it, soak it overnight in vinegar, and clear the holes with a pin. Same for a tap that has gone weak on its own: the aerator on the end unscrews and is usually full of grit.

Weak everywhere, or weak in one place?

That one answer decides whether this is a ten-minute clean or a change to the house. Ring us and say which.

Emergency line open 24/7 Booked jobs Mon to Sun, 8AM to 8PM

Call 0920 960 0596 Send the problem instead