Waterdrop Replacement for Culligan Water Filter RC-EZ-4
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Waterdrop Replacement for Culligan Water Filter RC-EZ-4

  • Waterdrop

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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.

Waterdrop Replacement for Culligan Water Filter RC-EZ-4

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Waterdrop Replacement for Culligan Water Filter RC-EZ-4


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
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