Black Elements & Fluoride Filters Replacement for Waterdrop King Tank Systems and Other Gravity-fed Filtration Systems

Regular price $86.99
Sale price $86.99 Regular price
1 Set - $86.99
2 Set - $169.98 ($ 84.99 each)
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  • Key Feature
    • This filter set combines BB9-2 black purification elements and PF-2® fluoride replacement filter.
    • The premium carbon block can absorb many impurities like chlorine, rust, sediment, taste, and odor.
    • Replace the BB9-2 filter every 6,000 gallons per pair and replace PF-2® every 1,000 gallons per pair.
    • Replacement for: Black Replacement Filters (BB9-2) & Fluoride Filter Combo Pack (PF-2®). Interchangeable with Travel, Big, Royal, Imperial and Crown Series and Gravity filter system. Waterdrop is an independent brand.
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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, 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, 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

Thank you for shopping at Waterdrop. We appreciate your decision to purchase our products and aim to ensure a rewarding experience throughout your exploration, evaluation, and purchase process.

Order Cancellations:

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

1. If you contact us within 24 hours of purchase:

Since most orders ship the same day, kindly email us at contact or call us at (888)-352-3558 within 24 hours of placing the order. There will be no cancellation fees for standard items canceled before shipment. If the package has already been shipped, we will provide a prepaid label for return, and once we receive the package from you, we will issue a refund.

2. If you contact us after 24 hours of purchase:

  • In such cases, you will need to bear the shipping fee if the package is already shipped (subject to our system status, not the order status).
  • The product must be damage-free, packed in the original packaging we sent to you, and returned with the original receipt of purchase.
  • We will process your refund after receiving the package.

30-day Risk-free Return Policy:

  • You are eligible to return any item* within 30 days of receipt.
  • All returned items must be disassembled and repackaged as they were originally received.
  • The 30-day risk-free return policy applies to all item*.
  • No restocking fee will be charged, but customers are responsible for the return shipping cost. We will cover the return postage expenses in the case of any return requests related to a quality issue.
  • Please note that the 30-day risk-free return policy is only valid for orders* within the continental United States.

Return after 30 Days of Receipt:

  • You may still return any item after 30 days of receipt.
  • In this case, customers are responsible for the return shipping cost. The total cost of shipping will be deducted from your refund.
  • All returned items must be disassembled and repackaged as they were originally received.
  • A 10% restocking fee will be applied to all returned products. However, in the event of any return requests related to a quality issue, we offer free returns or replacement with a new product.

1-year Warranty:

Enjoy peace of mind and confidence in your purchase with our 1-year warranty, backed by lifetime technical support.

If you receive a damaged item and wish to file a claim, please email with your order information and a picture of the damaged or incorrect product. We are eager to assist you.

For products that become defective during the warranty period due to a quality issue, rather than your own breakage or misuse, we can accept a free return, provide free repair service, or issue a new replacement.

Exchange Policy:

1. Defective Products:

If you receive a product with quality issues or damages, please contact our customer service team within 30 days of receipt. We will provide you with a free exchange service. Please provide order information and photos of the damaged product when contacting our customer service team for better assistance.

2. Non-Quality Issues:

If you wish to exchange a product for non-quality-related reasons, please note the following:

  • The product must be within 30 days of purchase and unused.
  • The product must be returned in its original packaging, along with the original purchase receipt.
  • You will be responsible for the re-shipping costs.
  • Please note that the exchange policy is only applicable to orders made on the official

How to Return a Product?

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

Step 1: Contact our customer service team before returning a product. We will respond with return instructions within 24 hours.

How to contact us:


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

Step 2: Prepare the package after receiving confirmation from the customer service team, and please note the following requirements:

  • Include the order number in the package. You can print out the order detail page or leave a note inside the package.
  • Ensure the package contains the original receipt of purchase.
  • Return the product in the original packaging we provided.
  • The product must be damage-free (this does not apply to defective products, as damage will void the refund).

Step 3: Contact our customer service and provide your return tracking number. We will track the package and process your refund within 5 working days after receiving and inspecting the package.

General Information for All Returns:

1. Defective Products:

If you receive a product with quality issues or damages, please contact our customer service team. we provide free returns, replacement with a new product, and comprehensive technical support.

2. Non-Quality Issues:

  • You are responsible for shipping the products to the return address provided.
  • Returned items will undergo inspection before issuing a refund.
  • Refunds will be processed within 5 working days after the item has been inspected, and it may take 4-7 days to be reflected in your credit card statement.
  • We highly recommend using a traceable and insurable shipping method for your return. We are not responsible for returns lost or damaged in transit, and you will need to file a shipping claim.
  • Please note that orders made via 3rd-party sellers, including Amazon, are not eligible for our return policy.
  • All returned items must be disassembled and repackaged as they were originally received. Items returned in a condition other than "like new" will be subject to a 10% restocking fee to cover repairs or part replacement. The restocking fee will be deducted from your refund.

Return Address:

Ecolife Technologies, Inc.

1951 S Lynx Pl,

Ontario, CA 91761

United States

Tel: 888-352-3558

Price Match Policy:

At Waterdrop, we highly value our customers' shopping experience. That's why we offer a 30-day price match guarantee. If you happen to notice a price reduction on the item you purchased at within 30 days of your purchase, you are eligible to claim a price-match refund. To request a refund, please contact us at We are here to assist you promptly.

Note: This Waterdrop price-change refund policy only applies to items shipped and sold by If you're buying from a different vendor, you'll need to contact that seller if the price drops.

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Full compatibility
Professional Design
As an ideal system for home, traveling, outdoor activities and emergencies, the filter can provide you with clean and quality water at home and outdoors.
Simple Installation
All you need to do is to connect the black filter with the white filter, saving your time and effort.
Compatible with: Black Replacement Filters (BB9-2) & Fluoride Filter Combo Pack (PF-2®). Interchangeable with Travel, Big, Royal, Imperial and Crown Series and Gravity filter system.
Same performance but a lower cost
Full compatibility
Affordable And Effective
Reasonable supply without compromising quality. Our supply is less than half of the name brand, allowing you to enjoy clean and fresh water while saving money.
Better Water For Your Family
To protect your family, Waterdrop provides quality, safe and great-tasting drinking water for you and your loved ones.
Same performance but a lower cost

Do the waterdrop replacement filters fit with the original brand?

Waterdrop 7990 water filter can perfectly fit the original brand.

What are the Waterdrop WD-7990 replacement made of?

The filter uses natural coconut shell activated carbon and food-grade fluoride remover with the BPA free housing.

What does WD-7990 water filter out?

It is safe and efficient to remove harmful contaminants such as chlorine, fluoride, odor, sediment and large particles.

Does the WD-7990 water filter remove lithium?

No. It is our understanding that Lithium is a mineral. The WD-7990 Purification Elements do NOT remove minerals.

Do the WD-7990 filters reduce fluoride in the water?

Yes, the WD-7990 Purification Elements can initially reduce Fluoride up to 99.9%. However, the efficiency of removing Fluoride begins to lose after a few hundred gallons.

Why does my filtered water have a bad taste?

Generally, the reason for having a bad taste in your filtered water is coming from not having enough priming filters. The bad taste is from process dust that may have remained from the initial priming process. Please try priming your filters a couple of more times throughout.

How long does a WD-7990 filters last?

Each set of two PF-2® filters should be replaced after approx. 1,000 gallons, while PF-2® filters should be replaced after (1,000/5), or 200 days if you have a two filter you used 5 gallons of water per day. Then, they should be replaced about every 6 months.

Does the Waterdrop water filter remove Chloramine?

Yes, Waterdrop WD-7990 replacement filters do remove Chloramine.

How does the filter element in the original system deal with viruses?

The micro fine pores are small, micro fine particulates such as bacteria, viruses and even food coloring particulate are prevented from passing through the tortuous path. These contaminants are trapped in the micro fine pores while the much smaller H2O molecules are not.
38-100 °F / 0.6-38 °C
Filter capacity
BB9-2 filter every 6,000 gallons, PF-2® every 1,000 gallons per pair
The Waterdrop WD-7990 is compatible with following model numbers:
BB9-2 & PF-2®
Other Brands
Big Berkey, Boroux Purifier Filters, Waterdrop WD-7990, AQUACREST AQU-7990, Filterlogic 7990, Waterspecialist 7990, Maxblue MB-7990.

*The following claims have not been tested and certified by NSF: compatibility claims.
The above statement is accordance with the NSF General Policy 25. Please note the certification information is only applicable to Waterdrop, not representing other brands on this page.

**The above brands do not source or sponsor the water filter. The manufacturers' names and model numbers have been used for reference purposes only.
The manufacturer is HongKong Ecoaqua Co., Limited. Made in P.R.C