Waterdrop Gravity-fed Water Filter System, NSF/ANSI 42&372 Standard, Reduces Fluoride and up to 99% of Chlorine, with 4 Filters and Metal Spigot, King Tank Series, WD-TK-A-FS, 2.25G
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Returnable until Jan 31, 2026
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Availability:
In Stock.
Arrives
Monday, Jun 1
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Style: Advanced Fluoride System
Features
- Large Capacity: The 2.25-gallon Waterdrop King Tank water filter serves a family of 4 for indoor/outdoor use. Pre-use flush required by connecting to a faucet for 1 min. Incompatible faucets may splash but do not compromise filter integrity.
- Outstanding filtration: Using coconut activated carbon, our water system removes up to 99% of contaminants like chlorine, fluoride, and heavy metals, enhancing taste and odor. Waterdrop operates as a separate brand.
- Certified excellence: This system holds certifications from IAPMO R&T against NSF/ANSI 372 for lead-free materials (0.25% lead), and its filters are certified against NSF/ANSI 42 in Model ECF-7066.
- Longer filter lifespan: The two fluoride filters (white) and the two carbon filters (black) can effectively filter up to 1,000 gallons of water and 6,000 gallons of water, respectively.
- Comprehensive accessories set: This filter system ensures safe, stylish use with 304 stainless-steel housing for durability, includes a leak-proof metallic spigot, non-slip stand for stability, and comes with all necessary accessories.
Brand: Waterdrop
Special Feature: NSF/ANSI 42&372 Standard
Product Dimensions: 9.45"L x 9.45"W x 15.75"H
Material: Stainless Steel
Capacity: 2.25 Gallons
Included Components: Upper Chamber*1, Lower Chamber*1, Metal Spigot*1, Water filter*4, Stand
Package Information: Box
Installation Type: Freestanding
Purification Method: Activated Carbon
Power Source: Gravity-fed
Brand: Waterdrop
Special Feature: NSF/ANSI 42&372 Standard
Product Dimensions: 9.45"L x 9.45"W x 15.75"H
Package Information: Box
Installation Type: Freestanding
Power Source: Gravity-fed
Model Name: WD-TK-A-FS
Supported Water TDS Level Maximum (PPM): 1000
Manufacturer: Waterdrop
Part Number: WD-TK-A-FS
Item Weight: 11.43 pounds
Item model number: WD-TK-A-FS
Style: Advanced Fluoride System
Item Package Quantity: 1
Special Features: NSF/ANSI 42&372 Standard
Batteries Included?: No
Batteries Required?: No
Date First Available: November 27, 2023
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Jun 1
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: Advanced System
So far, so good! We live in east central Texas and our water is horrible. There are doctors in town that warn patients about the high sodium content in our water. It's awful. I did extensive research into gravity fed water systems and landed on the Waterdrop King Tank. We were impressed with the third party testing and certifications that Waterdrop has for their products (only found two that had this). This system was really easy to assemble. Really straight forward and everything felt like great quality! The spigot itself was so heavy you can tell its fully metal and well made. The filters were easy to soak. I will admit, priming them wasn't the funnest thing but honestly if that what someone would complain about, they are just lazy! Its really not that bad. You only have to prime it for 60 seconds. The water filters through very quickly. Which we hope is not a sign of poor filtration but according to their testing, it must work well. I had my first glass of water from it last night and it was incredible to have a glass of water that did NOT taste like a salty swimming pool. And no chlorine aftertaste. I'll be making our own stand to save money but even without it looks really nice on our counters. The 2.25 gallons will work well for my family of four in hot Texas. Especially since it filters so quickly. Can't be done until I mention price. We happened to catch it on sale which is what made our final decision. You just can't beat getting a third party tested system that OUT PERFORMS Berkey and is a fourth of the cost. Plus the filter replacement price is unbeatable when comparing literally all of the other brands we looked at and those (all but one) were not even third party tested and certified. All to say, very satisfied and would probably recommend this to a lot of people.
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Reviewed in the United States on September 21, 2025 by Amazon Customer
Style: Black Carbon Filters
Great filters. No complaints. Tested first several gallons via food coloring test. Passed with no issues. Water tastes great. Highly recommended.
Reviewed in the United States on November 25, 2025 by electro
Style: Advanced System
I've been using this for about 9 months now and I can say it was definitely a good purchase. It is very easy to fill up and lasts about a day each refill for how much water I drink and the water just feels better to drink. The area I live in has a lot of chemicals and metals in the water and I fully believe this has improved the water quality of our drinking water.
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Reviewed in the United States on November 24, 2025 by Kyan G
Style: Advanced System
I’ve been eyeing a Berkey for a few years, but they don’t ship to California, so I was excited when I stumbled across the WaterDrop gravity flow system that’s basically the same thing. It’s a major bonus that it’s a few hundred dollars cheaper. There isn’t a sewer system where I live, and the ground water is terrible. I got a humidifier a few years ago, but have been unable to use it because after filling it with tap water, the mist coming out of it would smell like urine. I’ve been happily using my humidifier for the past few days and it smells like nothing. I also did the red dye test after it was assembled, and the water came out crystal clear. I’ve had no issues with leakage after assembly either. The reason I’m giving it 4/5 stars instead of 5/5 is for two reasons: 1) Before assembly and every month afterwards you’re suppose to prime/flush the filters. They supply you with a gasket that you’re supposed to attach to the filter and to a water faucet (I’ve included a picture of this next to my kitchen faucet). They state that the gasket will fit around most faucets, but unless your house was built in the 1990s or before, I’d guess there is at least a 50% chance it won’t fit due to the variety of sizes and shapes of modern faucets. I wish they had made one side of that gasket stretchier to fit over all fixtures. 2) While assembly wasn’t difficult, attaching the faucet wasn’t exactly easy either. They do provide you with a wrench, which is a bonus, but because the walls of the WaterDrop are rounded you can only tighten the bolt 1/8 of a turn at a time. It probably took me 15 minutes to attach it. If you don’t own a bendy ratchet it takes forever to attach the faucet and get it tight. They also recommend disassembling the whole unit every month to clean it. There is no way a normal person will want to remove that faucet every month and reattach it. Overall a great system, I would definitely recommend it.
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Reviewed in the United States on October 8, 2023 by Helena_Wren Helena_Wren
Style: Black Carbon Filters
Works great! Filters fast and tastes like filtered water!
Reviewed in the United States on December 7, 2025 by Clay F.
Style: Black Carbon Filters & Fluoride Filters
The media could not be loaded. Even though the TDS barely budged and it basically runs right through the filter /: we do think the water tastes soo much more clean, crisp, less drying in our mouth, and much more refreshing. However, lol… I’ve read “TDS readings won’t change after carbon filtration because a TDS reading includes the beneficial minerals a carbon filter like this is letting pass through, but doesn’t include the harmful toxins that a carbon filter is filtering…” but many toxins that these filters claim to filter ARE soluble (fluoride, nickel, aluminum, lead, tin, mercury, etc) and if they’re being filtered, it should reflect a lower TDS reading. I definitely don’t think “0” TDS is the goal and using distilled/evaporated water would be another step to leaving more solids behind… but you spend good money on a carbon filter that’s supposed to work via adsorption: it needs contact time to efficiently filter toxins and the more contact time, the more efficient filtration. So this flow rate is questionable too because it’s so fast the toxins aren’t getting the contact time needed to be trapped and adhere to the carbon. Ideally, who wouldn’t want to send a sample to a lab to know exactly what’s in it! We just cant swing that and the reviews online made us skeptical of the home kits too. Maybe it’s removing the chlorine since it smells and tastes great, but the flow rate and TDS reading are definitely worth knowing about.
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Reviewed in the United States on January 27, 2024 by Danika
Style: Advanced System
I received my waterdrop gravity -fed water filter system today. I am very impressed with it. We have well water and I did a taste test and the water was good. I feel it tasted just as good as bottled water. It was easy to assemble. It filters kind of slow but that's not a problem for me. I would recommend getting the stand with it. So far very happy with this product!
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Reviewed in the United States on October 25, 2025 by Sp2025 Sp2025