Waterdrop Replacement for Culligan Water Filter RC-EZ-4

Regular price $48.49
Sale price $48.49 Regular price
2 Pack - $48.99
Thanks for signing up for restock notifications!
There was an error signing up for restock notifications. Please try again.

Sign up for restock notifications

Notify Me

Guaranteed Safe Checkout

  • Key Feature
    • Advanced coconut shell carbon block filter can reduce chlorine, giving you fresh taste.
    • Food-grade plastic housing ensures your water stays pure always.
    • Cost-effective under counter water filter replacement reduces your maintenance cost by replacing only twice a year.
    • Stable and fast water flow always meet your need.
    • Click here to identify the difference between WD-RC-EZ/1/3/4.
    • Please note this is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only. Waterdrop is an independent brand.
Free Shipping ×
Shipping policy

Shipping rates and delivery estimates

Shipping Method

Estimated Delivery Time


Economy Shipping

4-10 Business Days


Standard Shipping

3-6 Business Days

$5.99(Free on order over $200)

Express Shipping

2-5 Business Days


* Shipping charges for your order will be calculated and displayed at checkout.

* The Delivery Time is calculated based on the shipping date, not the order date. The actual shipping date can be delayed due to invalid shipping address, weekends/holidays, etc.

Handling Time:

We need 24h to 48h to prepare your order, most of the packages will be shipped out within 24 hours except weekends and holidays.

Track your order

Once your order is shipped, you will receive an email from us containing the tracking information. Tracking information is also available in your "Order Details" page.

Shipping areas

The products can be delivered to the most of states in United States except American Samoa, Micronesia, Guam, Marshall Islands, Northern Mariana Islands, Palau, Puerto Rico and U.S. Virgin Islands.

International shipping

We are sorry that the international shipping service is not supported for the time being.

Shipping Carriers

We work with 4 carriers to make sure your order will arrive on time: UPS, USPS, FedEx and Amazon Logistics US.

Delivery Time Exceeded

Shipping might experience delay due to covid-19. If your order is delayed, please contact us via email service@waterdropfilter.com, we will check the situation with the transportation company in time. Thanks for your understanding and support.

Note: We don't accept requests to specify a certain carrier to deliver the package.

Shipping origin

The package will be shipped from one of our US warehouses closest to your location.

* If you have any questions, you can contact our customer via LiveChat or email to service@waterdropfilter.com, we will reply to you as soon as possible!

Sales Tax

The sales tax will be collected in accordance with U.S. tax laws. Customers whose delivery address within the following states will be charged a certain tax at checkout, and the tax rate is determined by the local government. (AZ, CA, CO, FL, GA, IL, IN, KY, MA, MD, MI, MN, NC, NJ, NV, NY, OH, PA, TX, UT, VA, WA, WI) All taxes collected will be reported and filed to the IRS on time.

30-Day Return ×
No Worries Guarantee

Thanks for shopping at Waterdrop. We appreciate the fact that you like to buy the stuff we build. We also want to make sure you have a rewarding experience while you're exploring, evaluating, and purchasing our products.


If you wish to cancel an order, please contact our customer service team

If you contact us within 24 hours of purchase:

We can cancel the order for you at no additional cost. The cancellation may take up to 3 days, thank you for your patience and understanding.

If the package is already shipped, we will issue a prepaid label and return your payment after we have received the package from you.

If you contact us after 24 hours of purchase:

You need to bear the return fee if the package is already shipped (depends on our system, not the order status).

The product has to be damage-free, packed in the packaging we sent to you, and with the original receipt of the purchase.

We will return your payment after we have received the package from you.

There are times when we may not have the product(s) that you choose in-stock or may face some issues with our inventory and quality check. In such cases, we may have to cancel your order. You will be intimated about it in advance so that you do not have to worry unnecessarily about your order.

Return Policy

We accept return reasons including defective, no longer needed, change mind, not as described, etc.

If you want to return the item without any quality issue, you need to bear the return fee yourself and pay 20% of the original order as a restocking fee. We will cover the return postage for return requests regarding quality issue.

Once you received a damaged / incorrect item and you want to file a claim, please email


together with your order information and the picture of the damaged / incorrect product. We are eager to help.

If you would like to return a product, please follow the next guidelines:

Step 1: contact the customer service team before return a product, we will reply you with return tips within 24 hours.

How to contact:

Email: service@waterdropfilter.com

Toll-free Tel: (888)-352-3558

Step 2: prepare package after you get confirmation from customer service team, please be noted the following requirements:

• The order number needs to be included in the package. You can print out the order detail page or leave a note in the package.

• The package needs to come back with the original receipt of the purchase.

• The product has to be in the packaging we sent in the first place.

• The product has to be damage-free (not applicable for defective products), damage on the product will void the refund.

Step 3: Please contact our customer service and send your return tracking number. We will track the package, and refund your money within 5 working days after we receive and check the package .

Return Window

We offer a 30-day return guarantee. Warranty will begin from the date the product is received. If a product grows defective during the warranty period due to a quality issue rather than your own breakage or misuse, we can accept a return, provide free repair service, or issue a new replacement.

Return address:

Ecolife Technologies, Inc.

17910 Ajax Circle

City of Industry, CA 91748

United States

Tel: 888-352-3558

Refund Policy

After receiving your request or your packages, it may take up 1-7 business days to refund your money. (Unfortunately, due to current situations and the COVID-19, your refund may require an additional 3-5 days to process. Thank you for your patience and understanding.)

Copy successfully!

The difference between WD-RC-EZ/1/3/4 explained

The WD-RC-EZ-1 is designed for basic filtration with the capability to reduce class III contaminants, chlorine, taste, and odor. The WD-RC-EZ-3 is intended for advanced filtration, while the WD-RC-EZ-4 – more expensive – is designed for premium filtration which contains supreme coconut shell carbon block to reduce up to 98% of chlorine and heavy metals like lead, and others. They can also reduce rust, sediments, bad odor, cysts, and other harmful substances like Chloramines, MTBE, VOCs, Particulate Class I, Turbidity, Mercury, etc.

Is the Waterdrop RC-EZ-4 filter compatible with other filtration systems of this brand?

Yes, the Waterdrop under sink water filter replacement RC-EZ-4 will work seamlessly with RC-EZ-1, US-EZ-1, RV-EZ-1, Brita USF-201, USF-202, DuPont WFQTC30001, WFQTC70001.

How do you replace the Waterdrop RC-EZ-4 replacement filter cartridge for undersink water filter?

Follow the steps below to replace your filter conveniently:
1. Relieve water pressure. You can do this by turning off the water supply and dispense any water left in the drinking water faucet. This relieves the pressure and stops the water flow.
2. Remove the old filter cartridge. You may use a towel to absorb the water that may flow out of the cartridge. To remove the old filter cartridge, turn the arrow from locked to unlocked and pull down the cartridge gently to detach it.
3. Install a new filter cartridge. Position the filter head with the arrow facing the unlocked position, then insert the cartridge. Turn the new cartridge to lock it, and finally turn on the water faucet to see if there is a leak.
4. If there is no leak, go ahead and flush water via the drinking water faucet. We recommend flushing for 10 minutes to get rid of the carbon particles. Finally, check for leaks again.

Does the Waterdrop RC-EZ-4 water filter only work with a cold-water supply?

The filter will work only at a temperature of 40℉-100℉. Anything outside this range will make it ineffective.

When should I change Waterdrop RC-EZ-4 filter?

The average lifespan of the Waterdrop replacement filter cartridges for the Original brand undersink filtration system is 6 months or 500 gallons of water. The usage will determine which comes first between the two conditions. Now you can save more by buying less bottled water and drinking more filtered water.

What contaminants can Waterdrop RC-EZ-3 undersink water filter reduce?

The replacement filter cartridge for RC-EZ-1 will effectively reduce contaminants like chlorine, sediments, rust, bad taste and odor. The filter is designed to deliver a constant supply of filtered water to you and your family.

What are the pros of Waterdrop replacement for RC-EZ-4 water filter?

This water filter replacement for this under counter water filter is made from advanced coconut carbon block, making it effective in reducing bad taste, odor, sediment, rust, sand, and chlorine in tap water. In the end, you get clean and great-tasting water for you and your household. The food-grade plastic housing signifies durability and a zero chance of second-hand contamination, where contaminants leach back into the filtered water. Aside from the safe experience, the filter's precise design ensures a perfect fit like the original brand.
Lastly, installation is easy – you need no tools to perform the twist-on – twist-off filter mechanism during installation.

What happens if I fail to change my filter after 6 months?

It is essential to replace your filter after 6 months or sooner, depending on the filter's performance or the degree of filtration it has been subjected to. Leaving your filters unchanged will lead to fatigue and adversely affect the filtration process.

Do I need tools or kits to install this under-counter water filter?

You need no tools or kits to install or operate the Waterdrop replacement filter cartridge for undersink water filter. It fits the indicated brands directly out of the box.

What are the common undersink water filter types and how do they work?

Conventional under sink filter
The feed water is sourced from the undersink cold water pipe. It passes through a flexible plastic tube and gets to the water filter. After filtration, it is transported from the filter to the dedicated filter faucet through another flexible plastic tube. The user gets the filtered water from this dedicated faucet right on the top of the sink. The filtration process starts when the user opens the tap, hence the system requires constant pressure to send the water from the cold water pipe to the filter and finally out of the faucet.
Simple under sink water filter
The source water leaves the cold water supply to the filter for filtration and finally dispensed through the regular water sink faucet. The hot water does not undergo filtration. The more common version is one without a distinct ledge as the flexible undersink pipes are easier to use. Unlike the hard copper undersink pipes, the flexible pipes facilitate a simple and cost-effective DIY installation.
Most under counter water filters can deliver excellent filtration performance because they adopt activated carbon filtration, present as advanced carbon block filters. For the Waterdrop replacement filter cartridge for Culligan under counter water filter, the filtration is handled by the premium carbon materials sourced from the Sri Lanka coconut shell. This ensures the filter can always operate with a superior reduction performance.
Efficient filtration
Our replacement filter cartridges for Culligan undersink water filters can reduce chlorine and various other harmful substances in water.
Superior materials
Adopting natural coconut shell carbon block from Sri Lanka, our under sink water filter replacement can adsorb chlorine and reduce unpleasant taste.
The filter adopts food-grade plastic housing, preventing contaminants from leaching back to your water.
Perfect fit for the original system
This replacement filter is designed to fit with your original system, providing you with a great water experience without worrying about water leakage.
Stable & fast water flow
Waterdrop replacement filter cartridge for Culligan undersink water filter is designed to produce filtered water at a stable and fast water flow. You can now conveniently fulfill the water needs of your family or workplace.






Fits Culligan EZ change system
Reduces Bad Taste & Odor
Reduces Chlorine Taste & Odor
Reduces Lindane and Atrazine ×
Reduces chloramine taste & odor × ×
Reduces Heavy Metal × Lead Lead, Mecury, Arsenic
Reduces VOCs × ×
Lead Free Compliance
Flow Rate 0.5 GPM 0.5 GPM 0.5 GPM
Filter Life 6 months, 500 gallons 6 months, 500 gallons 6 months, 500 gallons