Cloudy Water After a New Filter
Cloudy water right after a filter change is usually just trapped air. When you install a dry filter, air inside the housing and the filter media mixes with the incoming water, creating millions of tiny bubbles that look milky or white.
In most cases, the water clears completely within a few minutes. You can test the water in a clear glass and run a normal flush cycle to push all the remaining air out of your system.
Why air gets trapped after a filter change
A brand new filter cartridge is completely dry inside before you install it. When water enters the cartridge for the first time, it must push out all the air that fills the spaces within the filter material.
As pressurized water forces its way through the cartridge, it breaks the air down into microscopic bubbles. These tiny bubbles mix into the water stream and give it a cloudy or milky appearance as it leaves your fridge dispenser or faucet.
This is normal for new filters. As you run water through the system, the air clears out and the cloudy look disappears.
The clear glass test
You can quickly check whether the cloudiness comes from harmless air bubbles or something else by using a simple glass test. This takes less than two minutes to do at home.
Fill a clean, clear drinking glass with water straight from your dispenser or filtered tap. Set the glass down on a flat counter and watch it closely without moving it.
- Pour a glass of cloudy water directly from your filtered tap or fridge door.
- Place the glass on the counter and watch it for one to two minutes.
- Look at where the water starts to clear first.
- If the water clears from the bottom of the glass toward the top, the cloudiness is trapped air bubbles rising to the surface.
- If the cloudiness clears from the top down and leaves particles at the bottom, or if the water stays cloudy, it is not air.
How to flush out the new filter
Always run some water through a new filter before you drink it. Flushing removes the trapped air bubbles and prepares the dry filter media for regular use. Follow the flush steps on the product box or the product page for your specific model.
For refrigerator filters, press and hold the water dispenser lever to run water through the door. It helps to run water in short intervals of a few cups at a time so the dispenser motor does not overheat. Continue running water until the flow is steady and no sputtering occurs.
For under-sink filters connected to your cold water line, turn on the dedicated faucet or cold tap and let the water run continuously for several minutes. A steady stream helps force trapped pockets of air out of the housing and tubing.
Sputtering and noisy lines during flushing
When you first start flushing a new filter, the water stream might cough, sputter, or spray unevenly. You might also hear light thumping or hissing sounds inside the filter housing or water lines.
These noises happen because large pockets of air are moving through the narrow water lines alongside the water. As the water pushes the air out through the faucet or dispenser tip, the air escapes in bursts.
Keep running the water. Once the air leaves the system completely, the stream will smooth out, the sputtering will stop, and the water will dispense quietly.
What to do if the water does not clear
If you completed a full flush and the water remains cloudy, check the glass test again. Water that remains cloudy after sitting for several minutes is not holding air bubbles.
Make sure the filter is seated firmly in its mount. An incompletely seated cartridge can allow air to get pulled into the water line every time the valve opens.
Check your household water supply as well. Fill a glass from an unfiltered cold tap in another room. If unfiltered water from other fixtures is also cloudy or discolored, the issue may come from municipal water work or your household plumbing rather than the new filter.
When to replace your filter next
Every filter is built to handle a set amount of water, which is its rated capacity. You should plan to replace the cartridge once it reaches that limit or when flow slows down.
Typical change intervals offer rough guidance. Refrigerator filters are typically changed about every 6 months. Under-sink cartridges that are not reverse osmosis are typically changed every 6 to 12 months. Pitcher filters are changed about every 2 months, and faucet filters about every 3 months.
Always follow the interval listed on the product page and in your user manual. Change the filter sooner if the water flow slows down significantly or your filter indicator light turns on. Many fridge indicator lights track time or water used rather than testing the water directly.
When to call a pro
If your water remains cloudy after flushing, if you notice leaks around the plumbing connections, or if you are not sure about plumbing work, stop and hire a licensed plumber.
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Questions
Why is my water cloudy after installing a new filter?
Cloudy water right after a filter change is usually caused by tiny, trapped air bubbles. As water fills the dry filter, it pushes out the air, creating microscopic bubbles that make the water look white or milky. It typically clears within a few minutes.
How do I know if cloudy water is just air?
Fill a clear glass with the water and set it on the counter. If the cloudiness clears from the bottom up as bubbles rise to the surface, it is trapped air. If particles settle to the bottom or the water stays cloudy, it is not air.
How much water should I flush through a new filter?
Follow the flush steps listed on the box or product page for your specific filter. Run water through the tap or dispenser until the stream is steady, no air sputters out, and the water flows clear.
What if my fridge water sputters when I first use it?
Sputtering happens when pockets of air leave the water lines through the dispenser. Continue flushing water through the system. The sputtering will stop once all the trapped air is pushed out.
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General information, not a substitute for your system or fridge manual. Our filters and systems are made by Waterdrop. Brand names are used only to show fit.