Frequently Asked Questions

Most Asked Questions

How is ZeroWater different from other systems?

Most conventional water filter jugs use 2 stage water filters whereas ZeroWater water filter jugs use a patented FIVE stage filter. ZeroWater filters use Ion Exchange Technology as opposed to a simple carbon only water filter. ZeroWater filters remove virtually all (99.6%) of the detectable dissolved solids while leading brands remove only up to 50%.

How long does a ZeroWater filter last?

This will depend on the TDS value of your tap water (you can measure this using a TDS meter). The TDS value indicates the level of organic dissolved solids present in your tap water. The higher the TDS, the faster the filter will need to be replaced.

Check the TDS value of your tap water and then use the table below to find out how much water you can filter with each ZeroWater filter.

TDS -> 000-001 -> clean water 

TDS -> 002-050 -> low pollution -> 150+ liter per filter

 TDS -> 051-200 -> average pollution -> 100-150 liter per filter 

TDS -> 201-300 -> high pollution -> 50-100 liter per filter

 TDS -> 301-400 -> very high pollution -> 30-50 liter per filter

TDS -> 401+ -> extremely high pollution -> less than 30 liter per filter

Do ZeroWater products contain BPA or BPS?

No, all ZeroWater products are BPA- and BPS-free

What is the ZeroWater TDS meter reading?

The TDS Meter included provides a reading of Total Dissolved Solids in Parts Per Million, ppm.

What are total dissolved solids?

Total Dissolved Solids, or TDS, are tiny non-organic particles found in water. They can come from natural sources like minerals in soil, but also from human-made elements such as road salts, old piping, pesticides, and fertilizers.

While not all dissolved solids are harmful, they do affect how water tastes and may signal the presence of unwanted substances. That’s why reducing TDS can make your water not only cleaner, but also taste noticeably fresher.

ZeroWater

Use and care

Which filter fits in which water pitcher/dispenser?

The ZeroWater 5-stage replacement filter fits into all our pitchers and water dispensers.

Our specialty drinking cup filters fit into the ZeroWater water bottles. Unfortunately the bottles are no longer available to buy. However, if you have bought one in the past, you can still buy the filters that fit it.

What materials are ZeroWater products made of?

ZeroWater filters are made of BPA- and BPS-free polypropylene. ZeroWater water pitchers and water dispensers are made of BPA-free polypropylene and ABS (acrylonitrile butadiene styrene).

How do I clean my ZeroWater pitcher/dispenser?

To keep your ZeroWater pitcher or dispenser fresh, simply wash it with lukewarm water and a mild soap. Rinse it thoroughly, then dry with a paper towel for the best results. We recommend avoiding cloth towels, as they can sometimes leave behind soap residue that may affect your TDS reading.

Important: Only clean the pitcher or dispenser, there’s no need to clean the filter itself.

Can I wash my ZeroWater pitcher/dispenser in the dishwasher?

No, we do not recommend using the dishwasher to clean your ZeroWater pitcher or dispenser.

Can I purify water other than tap water with ZeroWater?

ZeroWater filters are designed to reduce impurities in drinking water, and we’ve specifically tested them on tap water. While the filters may technically work on other types of water - like rainwater or stream water - we can’t guarantee the results outside of tested use.

If you’re considering filtering non-tap water, we recommend having it lab-tested first to ensure it’s safe to drink. Using ZeroWater this way is at your own discretion.

How long does it take for the water to run through a ZeroWater filter?

ZeroWater’s filtration process takes a bit longer than standard two-stage filters - and for good reason. Our advanced five-stage filter works harder to remove a wider range of contaminants, delivering cleaner and better-tasting water. A little extra time, a lot more peace of mind.

When should I change my filter

You should replace your ZeroWater filter when the TDS meter shows a reading of 006. We strongly recommend not using the filter beyond this point. Unlike standard filters, ZeroWater filters may cause a noticeable change in taste or smell once they reach the end of their lifespan.

In some cases, you might notice a change in taste or smell even before the meter reaches 006. This usually happens when your water contains a higher concentration of certain dissolved solids. If this occurs, we recommend changing the filter as soon as you detect the difference — your senses are a helpful early warning system.

For the cleanest and best tasting water, always trust both the meter and your own experience.

ZeroWater

Troubleshooting

I’ve put in a new filter but I’m not getting a 000 value.

ZeroWater should always give a 000 reading right from the start. If it does not, here are the most common causes — and how to fix them:

Residue in the pitcher
Leftover soap, dust or old water can affect your reading.
Solution: Clean all parts with mild soap, rinse well and dry with a paper towel before trying again.

Filter not sealed properly
If the filter is not tightly screwed in, tap water may leak past the seal.
Solution: Remove the tank and screw in the filter firmly on a flat surface to ensure a tight fit.

Filter not fully flushed
Sometimes new filters need a little extra rinsing.
Solution: Run and discard a few full tanks of water, then test again.

Defective filter
If none of the above helps, there may be a small defect.
Solution: Check for cracks or an uneven silicone ring. If something looks off, send us a photo.

Still not getting 000? Reach out to our support team at [email protected]. We are happy to help.

Why are there black/brown specks in my pitcher / dispenser’s water tank?

You might notice small black or brown specks floating in the top water tank, this is perfectly normal. These particles come from the activated charcoal layer inside the filter. They are harmless and safe.

To reduce the chance of particles escaping, we recommend filling your water tank gently and avoiding pouring water directly onto the top of the filter.

My system takes too long to filter.

If your pitcher or dispenser is taking longer than usual, it may be due to an air bubble inside the filter or a vacuum at the bottom of the water tank. Here is how to fix it:

Step 1: Lift the water tank slightly to release any vacuum pressure.

Step 2: If that does not help, remove the tank completely and gently squeeze the center of the filter a few times while water is flowing through. You may see air bubbles rise as the flow improves.

Step 3: You can also lightly tap the filter against the edge of your sink to help dislodge trapped air.

To prevent this in the future, avoid pouring water directly onto the filter. Instead, pour beside it into the tank so water flows in more gently.

My filter was damp when I opened it

Yes, that is completely normal. At ZeroWater, we rinse the filter contents before packaging, so you do not need to flush or soak it before use. This process can leave a bit of moisture or condensation inside the bag, it is harmless and nothing to worry about.

Important: Never pour hot or boiling water over the filter, as this can damage it and stop it from working properly.

The water coming out of my filter is black or gray.

Some brand new filters can let fine carbon particles into the water due to the way they’ve settled. This is completely safe and can be fixed by flushing the system until the water is clear

My filtered water tastes or smells strange.

ZeroWater gives your water a softer, cleaner taste, perfect for tea and everyday drinking. If you notice a sour or lemony taste, it usually means the filter is almost used up.

Check your TDS meter:

If it reads 006 or higher, it is time to replace the filter.

If it reads 001 but the taste is off, consider changing it a bit earlier.

Once you reach a reading of 001, we recommend testing after each refill.

ZeroWater

About the filter

What substances does the ZeroWater filter remove?

Click here to view more information.

Do ZeroWater filters remove minerals from water?

Yes, ZeroWater filters remove all dissolved solids, including minerals. The filter does not separate good from bad; it removes everything to give you the purest water possible.

Most minerals your body needs come from food, not water, so this has little impact on a balanced diet. Still want minerals in your water? You can easily add them back by:

Adding a pinch of mineral salt or a drop of saline solution to your glass

Using mineral stones in your filtered water

Keep in mind: adding minerals will affect your TDS reading, so it will no longer show 000.

What is the best way to store unopened replacement filters?

Store your filters in a cool, dry, dark place. ZeroWater filters do not have an expiration date. However, we recommend using them within a year of buying.

Can I store my filter after opening?

The ZeroWater filter does not need to be constantly in water. If you are not going to use the filter for a few days, we recommend storing it in an airtight bag or container, and placing it in the fridge to ensure it stays fresh.

Please note: we recommend not storing or using a filter longer than 3 months after opening.

Can bacteria grow inside the filter?

The filter contains high-purity copper-zinc granulate which, in combination with activated charcoal, is very effective in reducing chlorine and hydrogen sulfide; it also prevents mold and bacterial growth.

Can I filter warm or hot water?

No. If you pour hot or boiling water over the filter, it will no longer function properly.

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About the TDS meter

When should I use my TDS meter?

We recommend measuring the TDS value of your filtered water regularly, everyday or every other day. You can vary the frequency depending on your water consumption. Once the measurement shows 001 ppm, we recommend measuring after each refill.

What does the TDS meter measure?

The TDS meter (included with every ZeroWater pitcher) indicates the total dissolved solids in parts per million (ppm).

Can I keep my TDS meter in the refrigerator?

We do not recommend doing this, because the humidity in the refrigerator can cause the batteries to oxidize. It is best to store your TDS meter outside the refrigerator.

My TDS meter stays at 000. What does this mean?

The most likely cause is that the HOLD function is on. This function keeps the measurement on the screen so that you can read it outside the pitcher. Depending on the meter model, the display will show HOLD when this function is activated. You can deactivate it by pressing the HOLD button again. Then try again. This should resolve it.

Help, my TDS meter doesn’t work anymore.

The batteries may have run out (2x LR44 – type dependent). These batteries should be replaced periodically. You will find the battery compartment at the top of the meter, behind the cap. Try again after replacing the batteries.

What type of batteries does the TDS meter use

They take either 2 – 357A, 2-LR44 or 3-AG3 batteries which can be found anywhere you would buy a watch battery.

What are Total Dissolved Solids?

Total Dissolved Solids are tiny organic and inorganic substances found in water. They include things like minerals, salts, metals and sometimes pollutants. TDS can affect the taste, smell and appearance of your water.

These solids can come from natural sources like surface or well water, but also from materials your water touches along the way, such as plastic or old pipes.

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Certifications

Is ZeroWater certified?

Yes, ZeroWater filters are official certified. You can find more information about our certifications on this page

Do you have a performance data sheet?

Yes click here to go to the sheet.

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Order, delivery and shipping

When will my parcel be shipped?

If you order and pay before 8:00 PM CET on business days, we will ship your parcel the same day.

For products that are sent from our warehouse in Spain, orders placed before 5:00 PM CET will be shipped the same day.

Orders placed after the cut-off time will be shipped on the following business day.

Can I track my order?

After we have passed your parcel to our courrier, you will receive a track & trace code. You will then be able to track your parcel, or change your delivery date and delivery address if needed.

Which courier do you use to send parcels?

We currently ship with PostNL, DPD, Seur and their partners. We have a very good relationship with them and trust them completely with our deliveries. If there is any issue with your delivery, please let us know so that we can resolve it as soon as possible.

How do I get my free product or discount?

If a free product is available, you’ll see the option in your shopping cart. Discounts or free items linked to a voucher can be added on the payment page.

Please note: we do NOT give out discounts on request.

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Returns and exchanges

How do I return a product?

We are dedicated to fulfilling your order to your satisfaction. However, if you are not satisfied and wish to cancel your purchase, you can do so within the statutory period of 14 days after receipt of the order, without giving any reasons. This period starts on the day after your order has been delivered.

Do you want to return a product? Then let us know via the contact form and send the product within 14 days of receipt to:

ZeroWater EU Returns

Herenweg 15

3602 AM Maarssen

The Netherlands

Return postage is at your own expense.

Make sure you include the original packing slip or a note with your contact details with the package, so that we know who to refund. If you do not do this, we cannot process your return package.

What do you send back?

Make sure that the products you return are clean and complete in the original packaging. Don’t forget the TDS meter. Unopened, sealed filters may also be returned. Include the original packing slip or a note with your order number so that we can find your order and process your return faster.

If the product is damaged during return, we may charge extra costs for this. Missing parts will be deducted from your refund amount.

Open filters: If you have already opened a filter, it does not need to be returned. For hygiene reasons, we are not allowed to take it back and resell it. We will deduct €10 (Euro) from your refund for each open filter (even if it came with the pitcher or dispenser).

When will I receive my refund?

When you return a product, we will refund the full purchase amount, including shipping costs. This will be done within 14 days after we receive the returned items. Please note that the costs for returning the product are at your expense.

Can I exchange a ZeroWater product?

Of course it is possible to exchange products. Please note that the above return conditions apply. We will send the exchange item(s) within 5 days after we receive the returned item(s).

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