Why is Less Water Flowing from the Water Purifier? Solution Guide

Water treatment systems, which are one of the most reliable ways to reach clean and healthy water in our homes, may experience various performance losses from time to time. One of the most common problems faced by consumers is the weakening of the water flow. According to industry research, water purification failures in technical services about 45% of the complaints transmitted to the device does not give water, not working or stopping. At this point, the water purifier in your mind why little water flows from the water purifier The answer to the question is usually hidden in a few hardware factors that are quite simple to solve. When you open the tap, the water flows like a thin rope or just drop by drop, although it is annoying, this situation often does not mean that your device is completely broken.

If you are a user of home or workplace water purifiers, there are many control steps you can do on your own before calling an authorised service. You can restore your device to its former performance by identifying basic problems such as clogged filters, depressurised tanks or minor valve malfunctions. In this comprehensive guide, we’ll take you step by step through why water is flowing slowly from your appliance, how to troubleshoot the problem at home and when parts need to be replaced.

Main Causes of Low Flow of Water from Water Purifier

Water treatment systems are integrated mechanisms in which water is filtered and stored through various stages and then delivered to your tap. In order for this system to work properly, the parts of the device and environmental factors must be in harmony. Hardware and environmental factors that cause the device to give less water can be listed as follows:

1. Water Tank (Expansion Tank) Air Pressure Drop

Water purification tank (expansion tank) located inside the water purifiers, has a two-compartment structure. While the upper part accumulates purified clean water, the lower part contains compressed air that pushes the water towards the tap. Over time, the air pressure in this lower compartment may decrease or run out completely.

A drop in air pressure in the tank (ideally in the range of 5-7 PSI) leads to the water not being delivered to the tap. If you feel that the water tank is full and quite heavy when you open the tap, but the water does not flow from the tap, the source of the problem is most likely the end of the air pressure. In this case, the water flow rate of the system can be restored by pressurising the tank air.

2. Clogging of Membrane and Prefilters

The membrane filter, known as the heart of Reverse Osmosis technology, cleans heavy metals, bacteria and lime in water by passing through pores one millionth of a millimetre in size. However, over time, heavily calcareous water, sediment and organic substances coming from the mains water create filter blockage in these filters.

Clogging of pre-filters (sediment and carbon filters) or directly of the membrane is the most important factor that physically slows down the passage of water. When the pores are closed, the passage of water becomes difficult and the treatment process is interrupted. This not only slows down the production of clean water, but also disrupts the wastewater balance of the device and causes more water to be discharged into the drain.

3. Insufficient Mains Water Pressure

The mains water pressure must be at a certain level (usually at least 3-4 bar) in order for the treatment device to pass the water through the filters. If the mains water pressure coming to your building or flat is low, the device has difficulty in pushing the water through the membrane filter.

In case of low mains pressure, the device cannot produce clean water and the water tank is not filled. Especially users living on the upper floors or people who use pressure reducers in their installations often experience this problem. In such cases, integrating an external pump motor into the system will provide a definitive solution.

4. Flow Restrictor and Valve Failures

There are important small parts in the system that ensure that the water is directed correctly. These are the shut-off valve (four-way valve), check valve and flow restrictor (such as flow 300 or 400) on the waste water side. When the check valve fails, the clean water accumulated in the tank may escape backwards, or when the shut-off valve fails, the system continues to discharge waste water continuously because it cannot cut off the water.

Complaints due to leakage account for 30% of water purifier problems. When the valves do not close properly or the flow restrictor is clogged, device leakage or internal pressure losses occur. If there is no water coming from the device, but waste water is constantly going from the discharge hose, this is the clearest indicator of valve failure.

5. Connection Faults: Bent Hoses and Closed Valves

Sometimes the problem is quite simple. The hoses of appliances installed under sinks or inside cupboards can be bent or broken over time by the impact of objects. The folding of the thin pipes through which the water passes naturally interrupts the flow of water.

At the same time, harsh temperature changes in winter months may cause hoses to lose their flexibility. Accidentally closing or leaving the inlet valve of the device or the water tank valve closed during cleaning or repair is also among the physical problems that stop the flow.

Step-by-Step Failure Solution Methods You Can Apply At Home

There are some tests and simple repair steps that you can do yourself before calling for technical service. By following the methods below, you can find the source of the problem and solve it practically.

How to Pump Air into the Treatment Tank?

If the appliance’s tank is full of water but you cannot get water from the tap, you will need to pump air into the tank. A standard bicycle pump or a small compressor is sufficient for this task.

Technical Expert Note: Always drain all water from the expansion tank before pumping air into the tank; otherwise you may get a misleading pressure reading due to the resistance exerted by the water.

• Firstly, close the main water inlet valve of the appliance.
• Open the treatment tap and wait for the water in the tank to drain. If the water does not drain, you will notice that the tank is quite heavy. Open the water tank valve cover on the bottom or side of the tank, just like a bicycle tyre.
• Attach the pump to the valve and start pumping air slowly. As you pump air, the water trapped inside will start to flow quickly from the tap.
• Keep pumping air until the water flowing from the tap is completely exhausted.
• When the water is completely empty, check the tank with a pressure gauge. The ideal pressure in an empty tank should be 5-7 PSI (approximately 0.4 – 0.5 bar).

Water Treatment Tank Ideal Pressure Comparison Table

How to Test Membrane Filter Blockage?

To understand the condition of your filters, you can perform a simple flow test. Close the water tank valve of your appliance (so that the water in the tank does not go to the tap) and open the purifier tap.

Diagnostic Troubleshooting Table (Symptom – Probable Cause – Quick Solution)

What Causes No Water After Filter Change?

The fact that the water does not flow immediately after changing the new filter is a situation that worries users. The most common cause of this is “air gap blockage”, that is, the system is making air. New filters are hollow inside and when water enters these filters, it has to push the air. This trapped air can prevent water from reaching the tap.

In addition, installation errors, such as not fitting the membrane filter into the housing, slipping of the gaskets or connecting the hoses to the wrong inlet-outlet ports also interrupt the flow. When you open the main valve of the device after the filter change, keeping the tank valve closed and leaving the tap open for a while to flush the system will solve the problem to a great extent.

Water Treatment How to Understand that the Membrane Filter is Broken?

If the problem is not caused by tank pressure, suspicion should be drawn directly to the condition of the filters. Here are the 5 basic signs of failure that indicate that your membrane filter has reached the end of its useful life or has failed:

• Change in Taste and Odour: If you notice a bitter, chalky or chlorinated taste in the taste of the water, the membrane has lost its filtering function.
• Reduced Production Rate: If the filling time of the tank is too long and the device runs for hours, the pores are clogged.
• High TDS Value: When the membrane outlet water is measured with a TDS (Total Dissolved Solids) metre, if the value obtained corresponds to a rate higher than 20% of the mains water, the filter cannot perform its function.
• Continuous Waste Water Discharge: If the device discharges high amounts of waste water for hours without stopping, it is time to change the membrane.
• Turbidity If the treated water contains turbidity or particles that do not persist for a long time when filled into a glass, the filtration quality is zero.

Transition to a New Appliance: Considerations in Appliance and Water Dispenser Selection

If your device is very old, if the filter housings are licking and constantly malfunctioning, it may make more sense to switch to a new device instead of repair costs. Due to the increasing cost of carboy water in Turkey, consumers’ demand for water purifiers has recently increased by 40%. In terms of Return on Investment (ROI), despite the annual filter maintenance costs, a water purifier amortises its cost within the first year of installation.

When choosing a modern device, the environmental dimension should not be ignored. While most of the wastewater generated in the world enters the nature, new generation devices with NSF approved and quality flow restrictor valves protect the nature by discharging minimum wastewater. In addition, in 80% of the old type water treatment devices analysed, losses between 75.1% and 100% of useful minerals such as magnesium, sodium and calcium were detected. Therefore, when buying a new device, you should definitely choose models with alkaline filters that supplement minerals. Thanks to today’s “Smart System Trend”, devices with digital sensors that notify you in advance that the filters are clogged and the water flow is about to decrease make life much easier.

If you are looking for practical solutions with these new generation technologies for your home or office, you can experience the comfort of accessing both hot and cold purified water at the touch of a button by examining the purified water dispenser options.

Frequently Asked Questions (FAQ)

What should I do if the water is running low? / What to do if the water is running low?

The main causes of low water flow from the appliance are clogged filters or lack of air pressure in the water tank. For a quick check, close the appliance’s water tank valve and open the tap. If the water flows thin as a thread but without interruption, your filters are probably fine, the problem is that the air pressure in the tank has dropped (the tank must be pumped full of air). If the water comes in drops, intermittently or not at all, your membrane filter is clogged and must be replaced. It is also a technical recommendation to check the mains water pressure in the flat.

Why does the water of the water purifier decrease?

The main reason for the decrease in water is that the lime, sediment and organic substances in the water over time fill the membrane filter pores and slow down the water passage. Other reasons include; decrease in the ideal air pressure (5-7 PSI) that should be in the water tank, insufficient mains water pressure, kinks in the connection hoses or water inlet valves that are left closed during cleaning.

How to understand that the water treatment membrane is broken?

There are five main symptoms of membrane failure:

• A noticeable change in the taste and odour of the water (bitter, chlorinated or chalky taste),
• Very low production rate of clean water and late filling of the tank for hours,
• When the membrane effluent is measured with the device, it shows a TDS (total dissolved substance) level higher than 20% of the mains water,
• The device continuously discharges a large amount of waste water even when the tank is full,
• It is the excessive turbidity of the water taken from the tap. In these cases, filter replacement is essential.

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