Water Filters
water filters — pre-owned
Browse 3,720 water filters — pre-owned on eBay — listings updated every few minutes. All items are pre-owned and sold by eBay sellers directly.

AQUATRU Carafe Countertop Alkaline Reverse Osmosis Water Purifier Used
I have 3 available in similar condition, may or may not have stickers on it. very clean excellent working condition. Made in the United States, this model is compatible with the AQUA TRU Carafe AT100.

Waterdrop D6 Reverse Osmosis Water Filter, 600 GPD Under Sink Reverse Osmosis
Waterdrop D6 Reverse Osmosis System. Fill a cup in as fast as 8 seconds with the built-in booster pump and large filtration surface. Why Choose Waterdrop D6?. Advanced Integrated Waterway. Compact D6 RO system saves 70% of your under-sink space than traditional system.
You save $70.00

Waterdrop M6H Instant Hot Reverse Osmosis System Countertop Water Filter 7-Stage
The Waterdrop M6H reverse osmosis water filter works anywhere with no installation required. Simply fill the feed water tank, plug it in, and enjoy purified water in the kitchen, office, or even an RV.
You save $168.00

Life Ionizers M7 Next Generation Alkaline Water Ionizer – Premium System
This unit is known for its powerful filtration, consistent performance, and long-lasting durability. M7 Ionizer Unit (as shown). ✔️ Advanced Alkaline & Acidic Water Modes. ✔️ Sleek, Modern Countertop Design.

Waterdrop Electric Water Filter Pitcher, 200-Gallon Countertop Water Purifier

Waterdrop X12 Alkaline Mineral pH+ Reverse Osmosis System,1200 GPD Fast Flow RO
【1200 GPD Fast Power】 Experience the ultimate upgrade in water purification with our 1200G high-speed tankless reverse osmosis water filter. Enhanced with an LED light for assured water safety. Our elegant tankless design makes DIY installation a breeze and saves more undersink space.
You save $400.00

Waterdrop G2 Reverse Osmosis System, 7 Stage Tankless RO Water Filter System
Compared to the ordinary RO system, the Waterdrop RO system always has a stable water flow. This tankless RO has a low drain ratio of 1:1 and saves water waste by 300%. 𝐈𝐧𝐧𝐨𝐯𝐚𝐭𝐢𝐯𝐞 𝐭𝐚𝐧𝐤𝐥𝐞𝐬𝐬 𝐝𝐞𝐬𝐢𝐠𝐧: The tankless design ensures the safety of your family’s drinking water.
You save $43.00
![[ Dual Flow ] Waterdrop X12-PRO 1200 GPD Reverse Osmosis Water Filter, Alkaline](https://i.ebayimg.com/images/g/pVEAAeSwmUFonbnX/s-l500.jpg)
[ Dual Flow ] Waterdrop X12-PRO 1200 GPD Reverse Osmosis Water Filter, Alkaline
It provides alkaline mineral water for drinking while ensuring cleaner water for cooking and cleaning. [Dual Water Flow] One line connects to the RO faucet for purified drinking water, while the other supplies filtered water for washing.
You save $400.00

Waterdrop G3P600 Reverse Osmosis System 8-stage Filtration-Certified Refurbished
Trusted Certifications: The Waterdrop G3P600 reverse osmosis system is NSF/ANSI 58 certified for TDS reduction and NSF/ANSI 372 certified for lead-free materials. It has also been tested and certified against NSF 42 for reducing chlorine, unpleasant taste, and odor.
You save $113.00

AQUATRU Carafe Countertop SMART WI-FI Reverse Osmosis Water Purifier
![[Dual Flow] Waterdrop WD-T4-A Alkaline pH+ Reverse Osmosis Water Filter,10-Stage](https://i.ebayimg.com/images/g/3DcAAeSwYcNpOSNZ/s-l500.jpg)
[Dual Flow] Waterdrop WD-T4-A Alkaline pH+ Reverse Osmosis Water Filter,10-Stage
The WD-T4-A RO system provides two choices of purified water: standard RO-purified and mineral-enhanced alkaline. Dual LED indicators monitor safety from filtration to faucet. A dedicated alkaline mineralizer then enriches the water with beneficial minerals for improved taste and health benefits.
You save $105.00

Waterdrop G3P800 Reverse Osmosis System, NSF/ANSI 42 & 53 & 58 & 372 Certified
Also certified to NSF/ANSI 372 for lead-free materials. Two holes required: one for the RO faucet and one for the drain pipe connection. ✅Certified Filtration Standards. ✨Sleek Tankless Design.
You save $50.00

Big Berkey Water Filter System 2.25 Gallon Stainless Steel NO LID
Big Berkey Water Filter System 2.25 Gallon. Stainless Steel. No filters.

Enagic ANESPA Shower Water Filter Unit w/ Hose, Silver/Blue Metal, 1 Pack
Enagic ANESPA Shower Water Filter Unit w/ Hose, Silver/Blue Metal, 1 Pack

Waterdrop KJ600 Reverse Osmosis System, Instant Hot Water Dispenser, 600 GPD
KJ-600 Instant Hot & Cold Reverse Osmosis Water System. 💧 Eco-Efficient & Fast Flow: With a low drain ratio of2:1 Pure to Drain, the KJ-600 saves water effectively. Get afast 600 GPD flow for cold water and a0.4 gal/min hot water flow —fill your cup in seconds!
You save $163.00

Waterdrop G5P700A Alkaline Mineral pH+ Reverse Osmosis Water Filter,NSF/ANSI 372
Improved 2:1 Water Efficiency : The system's 2:1 pure-to-drain ratio demonstrates greater water efficiency than many conventional RO systems, helping to reduce water waste during the filtration process.
You save $73.00

Avalon 2-Stage Replacement Filters ( READ DISCRIPTION)
We buy a lot of Avalon water dispensers that are damaged or returned that we pull the good parts off of . That is where these filters come from so these only had water in them for a short period of time. The Avalon 2-Stage Replacement Filters are designed specifically for use with Avalon water filtration systems. These filters have a capacity of 1500 gallons and utilize a combination of carbon block and sand filtration methods to effectively remove contaminants such as chlorine, lead, rust, and bacteria from your water. Suitable for household use, these multicolor filters are compatible with Avalon models and provide clean and safe drinking water for you and your family.

Waterdrop G3 Reverse Osmosis System, NSF 58&372 certified, Tankless RO System
[1: 1 low drain ratio]: Compared to traditional RO systems, Waterdrop Reverse Osmosis Water Filtration System saves water waste by 300%. [ NSF Certified Performance] : The system is certified against NSF 58 for TDS reduction.
You save $88.00

Waterdrop G5P500A Alkaline Mineral pH+ Reverse Osmosis Water Filter, Reduces TDS
The Waterdrop G5P500A provides clean, safe water with improved taste and odor. This allows for quick access to purified water, catering to busy households.
You save $60.00

Waterdrop G3P600 Reverse Osmosis System, NSF/ANSI 42 & 53 & 58 & 372 Certified
Trusted Certifications: The Waterdrop G3P600 reverse osmosis system is NSF/ANSI 58 certified for TDS reduction and NSF/ANSI 372 certified for lead-free materials. It has also been tested and certified against NSF 42 for reducing chlorine, unpleasant taste, and odor.
You save $113.00

Waterdrop Whole House Water Filter System, Certified Refurbished, Reduce Lead
With this system, you can enjoy consistently filtered water with improved taste. Installation is straightforward and can be completed by following the included manual. The 15 GPM high rate of this whole house water filter system can allow you to enjoy smooth water without any pressure loss.
![[Dual Flow] Waterdrop X12-PRO 1200 GPD Mineral PH+ Reverse Osmosis Water Filter](https://i.ebayimg.com/images/g/pVEAAeSwmUFonbnX/s-l500.jpg)
[Dual Flow] Waterdrop X12-PRO 1200 GPD Mineral PH+ Reverse Osmosis Water Filter
SGS-tested for reliability. It provides alkaline mineral water for drinking while ensuring cleaner water for cooking and cleaning.
You save $400.00

Waterdrop refurbished countertop water filter for sink,8000Gallons(with1 Filter)
Easy Installation: Designed for standard faucets, this countertop water filter system includes all necessary hardware—such as a wrench and adapters—for straightforward installation. By simply turning the switch, you can alternate between tap water and filtered water.

Big Berkey Water Filter System Stainless Steel Spigot 2.25 Gallons
The Big Berkey Water Filter System is a high-quality water filtration system made of stainless steel, with a spigot for easy dispensing. This system, produced by Berkey in the United States, can filter up to 2.25 gallons of water and is designed to provide clean and purified water for various household uses. Its durable construction and efficient filtration capabilities make it a reliable choice for improving the taste and quality of your tap water.comes with new filters and stand, was used for about 2 weeks

Waterdrop X12 Alkaline Mineral pH+ Reverse Osmosis System, 1200 GPD Fast Flow RO
⚡ 1200 GPD Fast Power. The faucet clearly displays TDS levels and filter life, making it easy to monitor water quality at a glance. Its elegant tankless design also supports easy DIY installation while saving valuable under-sink space.
You save $400.00

Waterdrop G3P600 Reverse Osmosis System 8-Stage Filtration Extra WD-MNR35 Filter
About the WD- G3P600 Reverse Osmosis System. The Waterdrop G3P600 RO system is NSF/ANSI 58 certified for TDS reduc tion and NSF/ANSI 372 certified for lead-free material. It's also NSF 42 certified to reduce chlorine, taste, and odor.
You save $119.00

Pure Water Distiller - Pure Water Midi D - With Tank / MDS / READ DESCRIPTION
A Pure Water Distiller - Pure Water Midi D - With Tank. / Model MDS. READ FULLY: It does power on and work. Overall a solid unit.

Waterdrop Refurbished TSU 0.01μm Ultra-Filtration Under Sink Water Filter System
It is specifically designed for municipal tap water and can only be used with cold water sources. It is not suitable for well water or hot water. This under sink water filtration system reduces 30+ substances, and retains essential minerals in the water.

Waterdrop G2P600 Reverse Osmosis System, 600 GPD RO Extra 1 WD-G2CF Filter
The G2P600 reverse osmosis system provides instant filtration and hydration without the wait. The G2P600 RO water filter features a tankless design, saving 70% of under-sink space. This is ideal for modern kitchens.
You save $58.00

AquaTru Classic AT2010 Water Purifier Countertop System
It is designed to remove contaminants such as PFOA/PFOS, lead, chlorine, fluoride, and more.

Multi Pure Water Filter Housing With Filter.
Used

Waterdrop G2P600 Reverse Osmosis System, 600 GPD, 7 Stage Tankless Water Filter
The G2P600 reverse osmosis system provides instant filtration and hydration without the wait. The G2P600 RO water filter features a tankless design, saving 70% of under-sink space. This is ideal for modern kitchens.
You save $63.00

Waterdrop X12-Alkaline Mineral Reverse Osmosis System, 11-Stage Filtration
Upgrade your water experience with this 1200 GPD high-speed tankless reverse osmosis system. The faucet clearly displays both TDS levels and filter life, making it easy to monitor your water quality at a glance.
You save $400.00

Brita Extra Large Ultramax 27 Cup Black Filtered Water Dispenser Filtration Syst
Gently used. In very good and clean condition. I pictured every angle of the item. You will only receive what you see in the photos.

Waterdrop Gravity-fed Water Filter System with 3 Carbon Filters & Metal Spigot
The Waterdrop gravity-fed water filter system includes three filters and is designed to provide consistent water flow for household needs. Made with 304 food-grade stainless steel, the system is designed for durable use.

Enagic LeveLuk Jr II TYH-201 - Kangen Electrolysis Water System. 60 Day Warranty
Enagic LeveLuk Jr II TYH-201 - Kangen Electrolysis Water System. Kangen Junior II machine in great condition cosmetically and machine wise. When you first turn on the machine, it will say notice Cleaning, which means to hook it up to the water and let it run it’s cleaning cycle. 60 Day Warranty. Buy with Confidence.

AquaTru Classic Countertop Reverse Osmosis Water Purifier System AT2010
The AquaTru Classic Countertop Reverse Osmosis Water Purifier System AT2010 is a high-quality water filtration system designed for household use. With a 4-stage filtration method, it effectively removes chlorine taste and odor, ensuring clean and refreshing water. Made in the United States, this countertop system has a capacity of 1 gallon and comes in a sleek white color. Compatible with AquaTru brand filters, this system is easy to install and maintain, providing pure water straight from your tap. Ideal for households looking for a reliable and efficient water purification solution.

Waterdrop WD-A2 Countertop Reverse Osmosis System Hot and Cold RO System 5-Stage
Itsall-in-one hot and cold design provides instant filtered water for drinking, tea, coffee, and more. Portable & No Installation Needed : Designed for convenience, this countertop RO water filter fits easily in kitchens, living rooms, offices, or even RVs.

Unger HydroPower Ultra DI Pure Water Filter System S (DIUH1)
Unger HydroPower Ultra DI Pure Water Filter System (Model DIUH1), Small size. Designed for professional window cleaning, this Deionizing (DI) filter produces pure water for a streak-free finish. Key features: - Integrated digital TDS meter for water quality monitoring. - KeyLock function for easy lid opening and closing. - Fast-Flo technology for efficient water flow. - Made in Germany. Condition: Good pre-owned condition. Shows minor cosmetic scuffs and dust from typical use. The exterior label has some light wear. Tested for physical integrity; digital meter turns on. Internal resin may need to be checked or replaced based on your specific water quality needs.
![[ Dual Flow ] Waterdrop G5P700A-Pro Alkaline Mineral pH+ Reverse Osmosis System](https://i.ebayimg.com/images/g/1~sAAeSwJHtpy3AE/s-l500.jpg)
[ Dual Flow ] Waterdrop G5P700A-Pro Alkaline Mineral pH+ Reverse Osmosis System
With a sleek size of16.69" × 5.69" × 13.9", this tankless RO system saves up to70% of under-sink space while preventing secondary contamination for consistently fresh water. It can also connect to appliances like your dishwasher, refrigerator, or ice maker for added convenience.
You save $108.00