12 Reasons Why Your Zero Water Filter Is So Slow? Facts!!!

ZeroWater manufactures portable water filter systems that are both convenient and easy to maintain. It is not as renowned as Brita or PUR, but they promise to be one of the best water filters on the market.

However, the filtration rate on the Zero Water dispensers and filter pitchers can be excessively slow at times.

Air clogs, increased sediment levels, hot water or mineral damage, or an outdated filter can all cause Zero Water Filters to be slow. It can also be caused by a high amount of Total Dissolved Solids (TDS). Incorrect filter installation and excessive use might cause the filter to run slowly.

There are 12 possibilities why your ZeroWater filter may be running too slowly. Below are specific causes, as well as a step-by-step method to fixing any issues.

You can restore your Zero filter speed to its previous state by following these steps. These will help you increase your overall performance while also saving money and effort.

12 Reasons Why Your Zero Water Filter Is So Slow?

zero water filter is too slow

First of all, keep in mind that ZeroWater filters are meant to eliminate 100 per cent of the Total Dissolved Solids (TDS) in your water, which means that filtering periods will be more extended (slower filtration).

It’s worth noting that all Zero Water Filters have a five-stage filtering technology that eliminates all dissolved particles from the source water. As a result, the filtering rate of the Zero Water filter is naturally slow.

Apart from that, if you believe that this is not the central issue, keep on reading to learn why your ZeroWater filter is so slow.

Let’s look into the reasons why the ZeroWater filter takes so long to work.

1- Nature of Water

The leading cause of your Zero Water filter’s slow performance is low water quality. In addition, poor water quality can block filters with silt or TDS, necessitating early replacement.

For instance, if you reside in a region where hard water is a significant issue, your ZeroWater filter may have a slow flow rate. Hard water includes an overabundance of impurities, which eventually clog the pore spaces of your water filter and hinder flow.

Likewise, water with an immense accumulation of chlorine might reduce the water flow rate. Toxins, sediment, and heavy metals in low-quality water shorten the life of filters and limit flow rate.

In this instance, we suggest installing a whole-house water filter before attaching the ZeroWater filter to your faucet.

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2. Air Trapped in the filter

Because of trapped air bubbles, the ZeroWater filter occasionally slows in function. Both old and new filters are susceptible to this problem, and it appears just as frequently in the filter pitchers as it does in the dispensers.

The carbon filter has a few tiny pores, and most air bubbles are caught in this media. It will either stop or slow the flow of water.

Once the air is caught in the filter, the water flow might be significantly slowed or stopped.

There are two ways to remove air pockets from your ZeroWater filter. ZeroWater recommends these ways. However, don’t hit the filter too hard, as this can break the filter’s bottom.


  • Remove the reservoir and filter from the pitcher or dispenser.
  • To effectively break up the air pocket, gently touch the side of the filter.
  • Fill the reservoir with an inch of water and place the filter and reservoir in the sink.
  • After flowing through the filter, allow the water to drip into the sink. It is necessary to dislodge the air pocket.
  • In the pitcher or dispenser, reinstall the filter and reservoir.


  • Lift the reservoir slowly and carefully.
  • Hold the filter’s body in the middle.
  • While there is water passing through the filter, squeeze it 4-5 times. The air pocket should be displaced as a result of this.
  • Replace the reservoir and filter in the pitcher or dispenser.

Also, you can soak the filter upright in cool water for 15-20 minutes to remove air bubbles. Keep the filter wet by submerging it in water and gently pressing the bottom to expel air bubbles.

3. Effects of Hot Water

The ZeroWater filter is solely meant to filter cold water. Hot water in the filter, on the other hand, can completely ruin the filter, resulting in:

  1. Due to filter damage or excessive TDS, your Zero water filter will perform slowly.
  2. Your Zero water filter may become clogged due to hot water causing holes in the filter and increasing the water flow rate.

For best results, ZeroWater recommends using only room temperature or colder water in their pitchers and dispensers.

4. Filter Become Too Old

If your Zero water filter has filtered more than it can handle, there is more storage of pollutants, and the filter will eventually clog. As a result of its prolonged use, your Zero water filter is draining slowly.

After about 20 gallons, the ZeroWater filters should be replaced by users.

All this, however, is dependent on the amount of TDS in your water.

Unfortunately, if your water contains relatively high silt levels or TDS, your ZeroWater filter will not survive as long as the maker recommends.

So, keep in mind when it’s time to change your filter, and you’ll have a steady supply of drinking water.

Based on the TDS of your tap water, here’s a simple guide on how often you should replace your ZeroWater filter:

Tap Water TDS Contaminant level Filter Lifespan
000 – 001 Similar to purified bottled water 40 gallons or more
002 – 050 Moderate 40 gallons
051 – 200 Normal range  25 – 40 gallons
201 – 300 High 15 – 20 gallons
301 – 400 Extremely high 8 – 15 gallons
401 + Extreme 8 gallons or less

Here you can observe that the amount of ZeroWater you get from each filter is determined by the level of TDS in your water.

As a result, ZeroWater recommends monitoring water quality regularly with a quality meter, which comes free with all pitchers and dispensers.

5. Installation Errors

When you change the old filter, you make a mistake in installation. A slow water flow rate can occur if the filter is not installed correctly. Filters that aren’t adequately installed will never filter water, and you’ll end up with dirty water.

Thus, be sure to follow the Zero Water filter instructions carefully:

  • Gently remove the cap and reservoir from the dispenser or pitcher.
  • Next, please take out the old filter from its place
  • Remove the blue protective cover and packaging from your Zero water filter.
  • Insert the filter into the reservoir’s bottom with slight pressure.
  • Make sure the installation is done correctly.
  • Tighten the filter until the filter o-ring and reservoir are entirely sealed.
  • For the filter gasket to stay in place, it must be attached securely against the water reservoir.


Before reinstalling the filter into your faucet filter mount or pitcher, ensure that the mounting surface is free of dirt that could harm your filtration equipment.

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6. Blockage in the Filter Housing Area

When replacing an old water filter, debris can quickly become trapped inside the filter housing region. This form of blockage is more typical in filtering devices like ZeroWater filters that need the water filter to be twisted into position.

The debris becomes caught in the housing’s holes. Thus, clean the housing area whenever you change or install a new water filter to avoid clogs.  

7. Mineral Deterioration

Mineral damage is one of the primary causes of your filter’s slow performance.

Mineral ions found naturally in our water supply, such as calcium and magnesium, can build scale deposits on surfaces that come into touch with water regularly.

Scale deposits accumulate over time, causing harm to your filtration system.

8. Filtering Other Beverages, such as Soda and Coffee

Some individuals test the filter’s efficiency by filtering coffee, soda, and a cold beverage. 

Contaminants, chemicals, and particles are abundant in these liquids. Your Zero water filter will be slowed down significantly as a result of this.

Make sure you don’t make the same error with your filter. It’s not healthy for your filter. The ZeroWater filter is only designed to filter water.

9. Tap Water Pressure

Low water pressure can reduce the filtering rate of the ZeroWater filter; however, the filter pitchers are unaffected.

High water pressure from your faucet, on the other hand, causes aeration of your water, which is when air circulates through your water.

This aeration might cause air bubbles to form in your filter, slowing down the filtration process.

Make sure your faucet isn’t turned on full speed to avoid aeration. Allow the water to flow gently and continuously; bubbles should not appear.

10. Clogged Filter

The filter may become clogged if your tap water includes too much sediment, such as clay, metals, rust, or sand. The filtration speed of a filter that has become blocked with particles decreases typically over time.

Unfortunately, water filters clog because they remove particles from your water, mainly what a filter is supposed to accomplish.

11. Excessive Filter Usage

The frequent use of water filters contributes to blockage and the need to replace filters before expiration. The pitcher’s TDS meter can assist you in swiftly calculating filter replacement time.

Excessive filter use in a short time can lead the filter to reach its maximum contaminant storage capacity.

It has an impact on the capacity and effectiveness of the filter.

12. Defected Filter

As previously stated, ZeroWater filters need replacements after every 20 gallons of filtered water.

Zero filters may go defective for no apparent reason. These parameters may help to confirm it.

  1. Water pressure is too low.
  2. Slow water filter flow, too quick filter’s flow, or clogged zero water filter
  3. Check for the existence of odours in filtered water
  4. Filtered water has an unpleasant flavour.

If you’re having these issues with your ZeroWater filter, we recommend that you replace it right away to avoid any health issues.

Final Thoughts

ZeroWater filter has years of experience in providing consumers with the most excellent water solutions. Although many individuals have been using Zero water filters for a long time, complaints about slow water filters are uncommon.

To summarize, Zero filters might slow down for various reasons, including air blockage, improper installation, high sediment levels, an outdated filter, or a malfunctioning filter.

Please keep a close check on the TDS of the water to make sure the filter is replaced when it’s needed.

Hopefully, you enjoyed and learned something informative from this article.

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