FAQs

Our name represents our shared commitment to providing you with easier access to clean, safer, and better-tasting water. By combining Culligan’s legacy of expertise with ZeroWater’s trusted filtration technology, we’re expanding access to high-quality water solutions and driving innovation for the future.

No. Our new filters were redesigned for simpler, top-down installation. They no longer twist in from the bottom like classic ZeroWater filters. This change makes filter replacement easier and cleaner, but it does mean the new filters aren’t compatible with older devices.

Of course! We're committed to all our customers, and will continue to supply our classic ZeroWater filters into 2026 & beyond. However, if & when you are looking to upgrade to our new range, drop us a line at help@culligan.co.uk and we'll get you sorted.

You can expect the same quality you know from ZeroWater, now backed by Culligan's resources. Our commitment to quality and care remains at the heart of everything we do. You can continue to trust our filters to remove virtually all total dissolved solids (99.9% of TDS) and reduce lead. We're proud to announce that we’re also certified to reduce total PFAS (forever chemicals), pharmaceuticals, and pesticides. For details on specific contaminant reductions, see our performance data sheet.

Our filters use coal-based activated carbon mixed with KDF (a copper-zinc blend) and a mixed bed of ion exchange resin in a BPA-free housing. Together, they work to reduce a wide range of contaminants, so all you taste is clean, better water.

Culligan with ZeroWater Technology filters are certified to reduce over 25 contaminants, including forever chemicals (total PFAS), pharmaceuticals, and heavy metals. For the full list of what we reduce, see our performance results here.

Culligan with ZeroWater Technology reduces virtually all total dissolved solids (TDS) from your water, giving you a level of filtration comparable to reverse osmosis or distillation, but with none of the hassle.

ZeroWater Technology versus distilled water

Distillation boils water and collects the steam, leaving most dissolved solids behind, but the process takes hours and requires electricity. Culligan ZeroWater filters use deionisation to reduce virtually all TDS in minutes, using just gravity. The result is similar purity, but with a fresher, more refreshing taste. No flat, boiled flavour here.

ZeroWater Technology versus reverse osmosis (RO)

Like Culligan with ZeroWater Technology filters, RO systems produce highly purified water, but they can be expensive and require installation. Culligan with ZeroWater Technology gives you similar results without the waste, hassle, or plumbing.

Our water filter jugs & dispensers are made from BPA-free materials. Our filters are housed in BPA-free polystyrene. Our pitchers and dispensers are made with BPA-free polypropylene and ABS plastic.

We’re sure you will love your products from Culligan Consumer Products UK, however there may be occasions where you feel it necessary to return an item. We aim to keep the process as simple as possible and these terms do not affect your statutory rights.

We will try to attend to all returns as soon as practically possible.

Unwanted Products

• If you are unhappy with an item when you receive it or if you simply change your mind please return it to us within 30 days, with the dispatch note, having taken reasonable care of it and in an unused state complete with packaging and all components, and we will refund you the price you paid for that product (excluding P&P).
• We will make the refund directly to the credit/charge card used to place the original order within 30 days or earlier once we have inspected the returned item and are satisfied that it has been returned to us in the condition it was in when delivered to you.
• You will only have to pay for the return postage of the Products.
• This does not affect your statutory rights.

30-day ‘Zero’ guarantee

• As per on-site messaging, we operate a 30-day guarantee on the basis of reducing your water PPM reading to 000, on our supplied TDS meters. If our products have not accomplished this and you wish to return your product, please get in contact at help@culligan.co.uk and we will arrange a return & refund for you.

Faulty Products

• We try to select and package the Products as well as possible to ensure they arrive in good condition. However, if a Product arrives damaged or with defects, or is not what you Ordered, we will replace it free of charge or provide a full refund as appropriate, if you return the Product to us at the postal address below within 30 days of receipt. In these circumstances we will also pay you the cost of the return postage. Please obtain proof of postage showing the amount paid to enable us to process the refund once the item is received.
• 0 - 30 days: You can claim a full refund for goods that are of unsatisfactory quality, unfit for purpose or not as described.
• 30 days - 6 months: You must give us an opportunity to repair or replace it before you can claim a refund.
• 6 - 12 months: You must give us an opportunity to repair or replace it before you can claim a partial refund, and the burden of proof is on you to prove the product is faulty.
• This does not affect your Statutory Rights.

Returning Unwanted or Faulty Products

• Please contact at help@culligan.co.uk to inform us of your wish to return Products.
• We may allocate you with a Returns Code which should be included with the package to improve processing of your return.
• We may also advise you how to send the item back to us. Occasionally items may have to be picked up by a courier service.
• You will be responsible for the returned Products until they reach us.

We will not refund the cost of gift-wrapping, your costs in returning the item to us and other services provided to you in connection with your purchase (eg. Express Delivery) UNLESS you are returning the item to us because of an error on our part (or because it is defective) under our 30-day Money-back Policy above.

Culligan with ZeroWater Technology water filter replacements are certified to reduce over 25 contaminants, including forever chemicals (total PFAS), pharmaceuticals, and heavy metals. To see the difference for yourself, explore our updated performance data sheet.

Our latest jugs and dispensers are thoughtfully redesigned for everyday ease, with upgraded features that make great-tasting water even easier to enjoy:

• Ergonomic handle for a more comfortable grip.
• Sliding lid for easy filling.
• Fully sealed top to prevent spills while pouring, even when full.
• No-drip spout for a clean, precise pour.
• Built-in TDS meter storage, so you always know your water quality.
• Space-saving design to fit perfectly in your fridge.

No. Our new filters were redesigned for simpler, top-down installation. They no longer twist in from the bottom like classic ZeroWater filters. This change makes filter replacement easier and cleaner, but it does mean the new filters aren’t compatible with older devices.

Yes. Our 5-stage filter contains activated carbon derived from coconut shell. This environmentally friendly material serves as an effective and non-leaching agent in our filtration process, ensuring superior water filtration results compared to other alternatives.

Our water filter jugs and dispensers use deionisation to reduce virtually all TDS in minutes, using just gravity - resulting in a purer taste. No flat, boiled flavour here!Total Dissolved Solids (TDS) are organic and non-organic sediments found in water, which contribute to a difference in the taste and appearance of water. Dissolved solids enter our water supply through old piping, run-off from road salts, pesticides, fertilisers and more.

Your meter reads Total Dissolved Solids (TDS) in your water, measured in parts per million (ppm). It gives you a real-time look at the quality of your water, so you always know when it’s time to change your filter.

Culligan with ZeroWater Technology removes 99.9% of total dissolved solids, including both unwanted contaminants and trace minerals. Our filters are designed to treat everything equally, reducing harmful elements along with minerals that may be naturally present in tap water.

Most health experts agree that your body gets the minerals it needs from food, not water. And according to the Water Quality Association, low-TDS water is safe to drink and widely used around the world. For more, we encourage users to read the Water Quality Association's article: "Consumption of Low TDS Water."

No. The TDS meter measures Total Dissolved Solids, not specific contaminants like lead, PFAS, or bacteria. Think of it as a helpful tool to monitor your filter’s performance. When the reading reaches 6 or higher, it’s time to replace your filter for the best taste and quality.

The lifespan of your filter depends on your local water quality and how much water your household uses. The best way to know? Use the included TDS meter. When the reading hits 6 or higher and the amber light turns on, it’s time to replace your filter. Don’t wait, past that point, taste and smell can start to change.

Your Culligan with ZeroWater Technology system is designed to inhibit the growth of bacteria. While no filter is immune to environmental conditions, ours is engineered to keep things clean inside.

Cleaning your jug or dispenser is simple, just a little soap and water.

Wash your jug or dispenser by hand using warm water and mild soap. Rinse well and dry thoroughly using a paper towel. We don’t recommend cloth towels, they can leave behind residue that may affect your water quality or TDS readings. To keep your filter in top shape, you can also rinse the exterior of the filter with warm water for about 30 seconds, then dry with a paper towel.

Important: Do not put your jug or dispenser in the dishwasher. Hand washing is best.

Store your filters in a cool, dry place, away from direct sunlight. As long as the filter remains sealed in its original packaging, it has no set shelf life.

Culligan with ZeroWater Technology filters come pre-rinsed and ready to go. Just install and pour. Any condensation you see is from our purified water rinse.

Yes. Most Culligan with ZeroWater Technology products are shipped in recyclable cardboard boxes, and most of our packaging can be recycled. Our newest boxes are made from at least 70% recycled materials and are FSC certified for responsible sourcing. Check each package for specific recycling guidance.

That slower flow is actually a sign your filter is working properly.

Culligan with ZeroWater Technology uses a 5-stage filtration system that does far more than a standard 2-stage filter. It reduces a broader range of contaminants, including total dissolved solids (TDS), which takes more time. That extra effort means a slower flow rate, about 192 ml per minute, but clean, great-tasting water is worth the wait.

Condensation on your filter is totally normal. Every filter is pre-rinsed with purified water before it’s sealed. This can cause a little water to build up inside the bag or under the lid, but it’s harmless and doesn’t affect performance.

Our jugs are built with a fully sealed lid so you can pour water from the clean reservoir, even while unfiltered water is still in the top chamber. That seal may feel snug when the jug is brand new. After a few washes and regular use, it will soften slightly while still staying secure.

The reservoir is designed to lock into place within a rib near the handle and a tab at the back. Make sure it’s properly aligned so it can sit flat and filter efficiently.

No need to worry, bubbles are normal. When you refill your reservoir, air can get trapped in the filter or along the sides. As water fills those pockets, you might see small air bubbles rise to the surface. They don’t affect filtration or water quality; they’re simply part of the refill process.

Your TDS meter is designed to provide a live reading, so you can instantly see the quality of your water every time you pour. As your filter reaches the end of its life, you’ll notice the TDS number gradually increases. Once the reading hits 6 ppm, the amber light will turn on, letting you know it’s time to replace the filter.

The amber light is your cue to change your filter. It turns on when your TDS reading reaches 6 ppm or higher, ensuring you’re always drinking water at its best.

Check for the white pull tab. It must be removed to activate the two AAA batteries inside the meter. Once removed, your meter should power on and begin displaying readings.

The meter runs on two AAA batteries, which are included and pre-installed. Just remove the white tab before first use.

To insert your meter:

1. Make sure the screen is facing outward.
2. Line up the metal pins with the receiver.
3. Press gently until it clicks into place.

Your meter should slide in smoothly when aligned correctly.

If your meter is showing a wave icon, this usually means moisture got into the docking station. To fix it:

1. Remove the meter.
2. Check inside the receiver area.
3. If it’s wet, gently dry it with a soft cloth.

Once dry, reinsert the meter. It should return to a steady live reading.

A proper filter seal is key to achieving a zero TDS reading. Make sure:

1. The filter is threaded properly into the reservoir.
2. The blue gasket is firmly seated and flush with the base.
3. There are no cross-threads or gaps letting unfiltered water through.

Since 1936, Culligan has reimagined what water can be, transforming it from an essential resource into something you can truly love. Every day, we help millions of people around the world enjoy clean, safer, better-tasting water through our expertise in sustainability, science and service.

Culligan is one of the world’s most recognized and trusted names in water, backed by a legacy of innovation, service and quality. Using proven science and advanced water technology, we filter, soften, and refine water to meet the highest standards of quality and taste. We provide expert service and support long after installation, offering complete peace of mind. We do it all with a relentless commitment to minimizing the environmental footprint of our customers and business. For more, visit: culliganinternational.com.

Culligan offers a range of installed solutions, from whole-home water softening, under-the-sink filtration, and reverse osmosis systems to convenient water delivery services. Whether you need better water at home or work, our experts are here to help. Start with a free in-home water test or schedule a consultation at culligan.co.uk.

Our name represents our shared commitment to providing you with easier access to clean, safer, and better-tasting water. By combining Culligan’s legacy of expertise with ZeroWater’s trusted filtration technology, we’re expanding access to high-quality water solutions and driving innovation for the future.

Our products are designed in the USA and manufactured with high-quality, globally sourced components. We partner with trusted suppliers worldwide to ensure our materials meet high standards for performance, safety, and reliability.