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

Regular price $76.99
Sale price $76.99 Regular price
1 Set - $76.99
2 Set - $149.98 ($ 74.99 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

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:


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.)

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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