Water Purifier Continuous Water Leaks: Causes and Solutions

One of the most common complaints about water purifiers, “water purifier constantly leaking water” is the problem. Users usually hear a continuous sound of water coming from under the counter or realise this situation with the high water bill at the end of the month. This leakage is either a water leak dripping directly out of the device or the waste water from the device’s drain hose to the sewer does not stop. Whichever the case, finding the source of the problem and solving it is much easier than you might think. In this guide, we will take you step by step through practical troubleshooting and repair methods that you can apply yourself at home before calling a service centre.

Before going into the technical details of the issue, it is useful to get to know some of the basic parts at the heart of the device. So you can understand where the problem is much more easily. If you are thinking of installing a new system water purification equipment You can make a smooth start by examining the latest technology purification devices in the category.

Why Does Water Purifier Continuously Flow Water (Waste Water Does Not Stop)?

All reverse osmosis devices produce clean water while at the same time removing heavy metals and lime from the water as waste water. However, this process must stop when the water tank of the device is completely full. If water continues to flow from the waste water line of your water treatment device for hours or even days, it means that there is a “stop order” problem in the system. Here are the four main reasons behind the wastewater problem:

1. Automatic Shut-Off Valve (Four-Way Valve) Failure

Shut-off valve is like the brain of your device. When the water tank is full, the back pressure inside pushes the diaphragm inside this valve, physically closing the water inlet from the mains. Over time, the thin rubber gasket inside this valve wears out, calcifies or tears. In this case, the valve cannot cut off the mains water even if the tank is full. The system continuously tries to produce clean water, and since the tank is full, the clean water produced and the accompanying waste water goes directly to the discharge. 70% of the continuous waste water problem is caused by the failure of this part.

2. Water Tank (Tank) Air Pressure Drop

Water treatment tanks are not completely hollow inside; there is a membrane (balloon) filled with air at the bottom. A certain pressure is needed inside this tank for the device to cut the mains water. Ideal tank air pressure should be between 6-8 psi when empty. If air escapes from the valve of the tank or the balloon inside the tank bursts, even if the tank is filled with water, that strong “back pressure” that will trigger the shut-off valve will not occur. The system thinks that the tank is not full and continues to produce water continuously and therefore continuously discharges wastewater.

3. Clogging of Reverse Osmosis Membrane Filter

The membrane filter is the most sensitive and critical part of your device. If the mains water is too calcareous or the pre-filters have not been replaced in time, the 0.0001 micron pores of the membrane filter become clogged in a short time. A clogged membrane cannot pass the water to the clean side. When the water coming from the mains cannot pass through the membrane body, it chooses the easiest way and goes directly to the waste water hose. In this scenario, your device both continuously flows water and the amount of clean water you get from the tap is reduced to a drop by drop.

4. Flow Restrictor Problems

The waste water choke is a small part at the end of the drain hose that brakes the water. If this part is blocked due to limescale, the device cannot discharge waste water and the membrane rots in a short time. However, in the opposite case, if the mechanism inside the throttler wears out and loses its ability to brake the water, the mains water flows quickly through the drain before it can reach sufficient pressure in the membrane. An important technical detail is the following: It is essential to use a throttler suitable for the membrane capacity. For example, for a 75 GPD membrane, a 300cc flow throttler must be installed. When you install an incompatible throttler, the device will constantly waste water.

Purifier Dripping Water: Sources of In-Device Leakage

Apart from the water flowing from the waste water hose into the sewer, you can sometimes see water dripping from the appliance body directly under your worktop. This is a leakage problem and is usually caused by connection errors or high pressure.

Filter Connections and O-Ring (Gasket) Wear

Filter covers (housing) in water treatment devices are sealed with high pressure resistant O-ring gaskets. During filter replacement, these gaskets may get stuck, harden and crack due to lime or the caps may not be tightened sufficiently. Especially if you see puddles under the worktop immediately after the filter change, the first place you should check is the filter housings. Lightly lubricating the gaskets (with food grade silicone grease) will stop this leakage immediately.

Loose Hoses and High Mains Pressure

Sometimes there are sudden pressure fluctuations in city mains water. In some regions in Turkey, the water pressure can reach up to 6-7 bar, which is quite challenging for plastic hoses and connection elbows (fittings). Over time, the high pressure stretches the hoses from their slots, causing micro water leaks. As an expert, I strongly recommend that a “Pressure Reducing Valve” be installed at the water inlet of the device to prevent such mechanical wear.

Step-by-Step Troubleshooting and Solution Guide at Home

You do not need a service to find out which of the problems mentioned above you are experiencing. You can easily find the defective part with simple tests you can apply at home.

How to Perform Membrane Inspection with Tank Valve Test?

This test is the clearest way to understand the overall health of your membrane filter and system.

• Close the small plastic valve on the water tank of your appliance completely (valve handle at right angles to the hose).
• Open the clean water purification tap on your worktop.
• In a few seconds the pressurised water inside will run out. Keep waiting.
• After approx. 30 seconds, a thin thread (the thickness of a toothpick) of water should start to flow from the tap without interruption. If the water flows thinly but uninterruptedly in this way, your membrane filter is intact. If no water comes out or a drop falls every 3-5 seconds, your membrane filter is completely clogged and must be replaced.

Tank Pressure Adjustment with Bicycle Pump

If you have successfully passed the tank valve test but the appliance still discharges waste water continuously, the problem may be the air pressure in your tank.

• Close the mains water inlet valve and the tank valve.
• Remove the tank (if it is heavy it is full of water, this is not normal).
• Open the blue or black cap on the bottom of the tank (sometimes on the side). You will find a valve like you would find on a car/bike tyre.
• Check the reading with a pressure gauge. If it is below 6-8 psi or zero, slowly pressurise with a normal bicycle pump. (Be careful not to press too much, the membrane balloon may burst).
• If you keep the purifier tap open while pumping air, the water trapped inside will be discharged. Stop pumping air when the tank is light.

Does the Waste Water of the Water Treatment Device Flow Continuously? (Normal Rates)

No, the wastewater of a healthy working device does not flow 24/7. Reverse osmosis systems only discharge waste water when the tank is full (while the device is running). When the tank is full, the waste water must be completely cut off. For 1 litre of clean water produced in a standard reverse osmosis device, approximately 3 to 4 litres of waste water goes into the sewer. If you have used 2 litres of water from the tap, the device will produce on average 6-8 litres of waste water to replace 2 litres and then stop.

These consumption figures may seem high to you. Indeed, according to EPA WaterSense data, which sets world-renowned environmental protection standards, a standard household with a conventional water purifier sends thousands of litres of water to the sewer annually. However, in a faulty device, this loss can reach horrible ratios such as 1:10.

New Generation Technologies: Permeate Pump and Tankless Systems

If you complain about the amount of waste water, you should take a look at the new generations offered by technology. “Permeate Pump” devices use the energy of the mains water to reset the back pressure created by the water filling the tank. This reduces the waste water ratio from 1:4 to 1:1.5. In addition, today’s “Tankless” water treatment devices produce water instantaneously thanks to their high-capacity membranes and reduce the wastewater ratio to extremely efficient levels such as 1:1 or 1:0.5.

Saving with Waste Water Utilisation (Grey Water Usage)

According to TurkStat data taken from official statistical institutions in our country, the average daily water consumption per person in Turkey is at a very high level of 255 litres. When we add the water wasted by the treatment device to this consumption, a serious waste picture emerges. However, it is possible to evaluate the waste water with the “grey water system” logic.

One of the most common questions users ask is: “Is wastewater poisonous water harmful to health?” Absolutely not. The waste water coming out of the device is only a condensed form of calcium, magnesium, sediment and lime in the mains water. Collecting this water in a bucket or large tank and using it for watering flowers, washing balconies, cleaning cars or flushing toilets is a great eco-friendly approach.

Water Treatment Dispensers and Featured Devices

Sometimes, trying to repair a device that is constantly malfunctioning, worn out and tired parts can be expensive. If constantly dealing with water leakage causes the parquet to swell or the kitchen cabinets to rot, it is time to renew your device. Especially for offices or crowded families, purified systems that offer hot and cold water together provide great comfort.

If you are looking for a solution that is both economical and stylish, I recommend you to examine the category of water purification dispensers designed for modern office and home environments. New generation dispensers completely eliminate the risk of flooding the house by automatically cutting the mains input in case of any water dripping thanks to the built-in leakage sensors. They also offer an environmentally friendly use by minimising waste water waste with integrated permeate systems.

Frequently Asked Questions

Why does the purifier constantly leak water?

There are four main technical reasons why the water purifier continuously discharges waste water. The most common reason is the failure of the Shut-off Valve (Four-way valve), which should cut off the mains water when the water tank is full. Secondly, a drop in air pressure inside the water tank (below 6-8 psi) causes the device to fail to recognise that it has reached full capacity. Thirdly, the membrane filter is worn out or its pores are clogged with lime. The fourth is the inability to brake the water due to the loss of function of the waste water flow restrictor (flow restrictor) part.

Does the wastewater from the treatment continuously flow?

No, the wastewater from the treatment does not flow continuously. Reverse osmosis (RO) systems only dispose of wastewater when filling an empty water tank (producing clean water). When the tank is completely full, the system automatically switches off and the wastewater output is reduced to zero. If wastewater flows continuously from the device for hours even though you do not use water from the treatment tap, it means that there is a pressure problem or valve malfunction in the device.

How to understand that the water treatment membrane is broken?

The most precise and practical way to understand whether the membrane is clogged or broken is to perform a “tank valve test”. Close the valve on the water tank of the appliance and open the treatment tap on the countertop. If the water flows uninterruptedly in the thickness of a thin rope, the membrane is intact. However, if the water does not flow or only slowly trickles, the membrane filter is clogged with limescale or particles. Other symptoms of membrane failure are the formation of limescale in the kettle, the taste of the water becoming bitter and the device constantly discharging waste water.

The purifier drips water, what should I do?

If you notice water dripping from the appliance (under the worktop), the first emergency action to prevent flooding is to immediately close the mains water inlet valve and the appliance water tank valve. Then dry the dripping area and find the source of the leakage. The problem is usually caused by loosening of the filter caps (housing) from pressure, O-ring (gasket) wear on the hose connection elbows or incorrect filter installation. You can solve the problem by tightening the loosened fittings with a spanner or renewing the gaskets.

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