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What Makes Your Water Filter Turn Black? Reasons + Fixes

what makes your water filter turn black


Are you suspicious to know what the black stuff is in my water filter? The black things in the water filter are the impurities and debris that get locked in the net of reverse osmosis drinking water and give it a blackish appearance. The most common reason for a black water filter is a problem with the filtering material. The granular particles get lodged in the filter, turning it black. The cycle continues indefinitely, resulting in the black cartridge filter. Furthermore, the issue occurs after you have fitted new filtration.

The carbon powder particles in the water tank flow with the water and make it unpure. It ultimately makes its way to the cartridge, which becomes lodged in a tiny spot, turning black. Because carbon particles will make the water taste awful, you must pay attention to the filter’s first wash to prevent particles from entering your main water pipeline.

The water quality problem has received much public attention in recent years. The good news is that most of us can get fresh, clean, and healthful water from a public or private well. This article will provide you with information on the following topics:

  • What makes your water filter turn black
  • Causes of water filter turning black
  • How to maintain your water filter?

What makes your water filter turn black 

The filtering material and debris are the most typical causes of Black Specks in Your Water. Carbon-based filtration is used in most reverse osmosis drinking water systems.  During the filtration process, microscopic carbon particles can pass through the water. The accumulation of these granular particles causes the dark color of the cartridge. The black cartridge filter is the result of the cycle repeating itself over and over again.  As a result, your water supply will be contaminated with carbon dioxide.

In addition, carbon is most likely used in the filtering process of your water filter. You may need to flush a lot of water to remove the carbon particles at the beginning. Eventually, after a few days, the carbon in the filter will fall to the bottom and will fix the problem,

Causes of water filter turning black

It is often asked what causes water to turn black. I have listed some of the main issues responsible for the blackish appearance of the drinking water filter.

1. Mineral Traces

Blackwater might come out of your faucets if there are too many mineral deposits in the water that runs through your house’s reverse osmosis drinking water system. Minerals like magnesium, manganese, and iron accumulate in your water system over time. When these minerals oxidize and come into contact the oxygen, they may become black, causing the water to turn black. The good news is that these excessive mineral deposits are usually safe for people to consume. Manganese in the water is toxic to the human body. It harms one’s health. Try to use the cheapest ways to remove manganese from water.

The presence of mainly iron and manganese in the water causes it to become black. A river or a well in the community provides water explicitly. The drinking water will become dark black if you do not conduct maintenance daily. Manganese is present in high concentrations in the river bodies, which look black or dark blue. The black sediments are caught during the filtering process, resulting in the black layer on the filter. The odor of the water will alter, indicating a high level of iron and manganese in the water. Stains may appear in the plumbing fixtures or when washing laundry. You can use the cheapest methods to remove iron from well water

2. Water Pipe Corrosion

 The construction of water pipes mainly uses iron. The iron particles rust and cause red corrosion around the surface over time. When water travels through the corrosion region, Well pumping up lots of black stuff, the minute iron particles are carried to your filters by the current. The filtering process may or may not detect these tiny particles. Depending on the state of the pipes, the trapped iron particles may appear brown or black.

It would be best if you inspected the pipes in your area. Replace the damaged line with a new one. Furthermore, this might be the solution to your Brita water filter black particles. To prevent pipe damage, you should maintain your home every few years. Call a plumber and have them inspect all of your home’s pipes. A rusted plumbing system may cause severe damage to your home or fail unexpectedly in the spring.

3. Mildew Growth

Mildew developing in your pipes or water heater may darken the water that travels through them, resulting in black water flowing out of your taps and causing the house water filter to turn black. If you believe mildew is forming in your home plumbing system, you should contact a professional as soon as possible. The presence of mold and mildew in the water might be hazardous to the health of everyone who drinks it in your home.

4. Black Sand in Water

It would be immediately apparent if your Well is pumping up lots of black stuff. All of the particles were captured by the home water filter and transported to the bottom of the tank. Check for signs of black sand when your house water filter turns black. When the water is drawn straight from a river or a well, the issue usually arises. The water carries the black sand and enters the pipe, leading to the filter connected to the main water line. The filter catches these silt or sand particles, turning your filter black.

There are the best sediment filters available in the market. Still, the tiny particles in your household equipment, such as washing machines and dishwashers, might cause harm to the sediment filter, clogging quickly. The answer is to collect water in a tank before sending it through your wall filter. The sand particles will settle at the bottom, while pure water will flow from the top to the filter, free of them.

5. Other Sediment Particles

Carbon filter black water might be due to sand or clay particles getting into your water if you obtain your water from a private well rather than a municipal water connection. You may remove sand or clay particles in various methods depending on your Wellness. If you have a sandstone wall, you may line it with a liner. You may put a screen in your Well or replace the current screen to keep sand and clay particles out of your water supply if you have a gravel or sand well.

6. Granular Activated Carbon

In the home filter, granular activated carbon filtration is the most prevalent. It serves as a filtering agent in the cartridges. Carbon has the potential to destroy hazardous microorganisms naturally. The water is clean and drinkable after going through the carbon-based filtering process. The granular carbon particles pass through the filter, with the water flowing over time, eventually trapped in the cartridge. Granular activated carbon is black; therefore, the cartridges will appear black after a few water filter filtration, resulting in carbon filter black water. Regularly, it would be best if you washed out the trapped carbon particles in the cartridge. 

7. Delay filter replacement/old filter system

Like a reverse osmosis water filter, some systems have unique maintenance needs. They have some membranes that need to be cleaned within some time. Following the instructions is critical since specific cleaning agents might harm the system for water filters. Like other home equipment, your water filtration system has a recommended lifetime; you have to replace it after some time. Using an outdated water filter may turn the house water filter black. A thorough maintenance regimen can extend the life of your filtration system, providing you and your family with cleaner, better-tasting, and healthier drinking water.

Granular activated carbon particles are good at absorbing tastes, smells, and pollutants from unfiltered water, which is why many water filtration systems employ them in their filter cartridges. Before investing money, you must know how long water filters last. Most water filters survive between six and twelve months. After the filter expiry, you still think, why is my well water filter black, so you need to go for filter replacement.

How to maintain your water filter?

You purchased a water filtration system to guarantee that your whole family has access to clean, safe, and healthy water at home. When you’re in a hurry, you can depend on your water filters for fast and simple drinking water, and it’s become a part of your routine. However, suppose your filtration system isn’t maintained correctly. In that case, it might lose its ability to remove impurities from your water, leaving a less pleasant taste in the liquid you drink every day.  Cleaning and maintaining your water filtration system is fast and straightforward, and it will help improve its effectiveness and efficiency, allowing it to last longer.


It’s critical to clean the interior of your water filtration system regularly to prevent a build-up of minerals, pollutants, or debris. Avoid using aggressive cleaning agents, and rinse the system gently with mild water. You don’t want to introduce any potentially dangerous contaminants into your system, which might absorb into the water you and your family consume. Make sure to clean all system parts every week, if possible. When cleaning your water filter, be sure to sterilize all system sections, including the water dispenser, line, and cap assembly.

Maintaining the water purifier’s external cleanliness is essential. To extend the life of your system by 12 to 15 years, you must clean it regularly in addition to using soapy water from the cleaner’s outside. Make sure to clean the tap that connects to the water purifier regularly. To extend the life of your water purifier, Urban Company has experts who can visit your house and give the assistance you need. A few processes can be done by oneself, but there is a chance that you may break something when you try to reassemble the system.


People are curious about what is the black stuff in my water filter. The mineral traces, pipe corrosion, black sediments, iron, manganese, and carbon filters can be the reason for it. This article explains why is my water filter black. When there are contaminants in the water, my water filter will turn black. So you need proper maintenance and cleaning of your tank. If you don’t clean the cartridge regularly, you risk contaminating your drinking water.

Particles of solid matter settle to the bottom of a water container. There is a wide range of sediment types and sources that you may find in groundwater. Minerals may be found in sediments, in addition to dirt and sand. If you want to know what kind of water you have, you’ll need to do a water analysis, which includes checking the pH, the hardness of the water (calcium carbonate), and the total dissolved solids.

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