Waterdrop Replacement for Aqua-Pure™ AP431 Hot Water Scale Inhibitor for AP430SS

Regular price $23.99
Sale price $23.99 Regular price
1 Pack - $23.99
3 Pack - $56.99 ($18.99 each)
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  • Key Feature
    • [Protects your water-using appliances]: Premium polyphosphates stop accumulation of corrosion and limescale, which may block your pipelines. This efficient filter media will keep your water-using appliance working optimally.
    • [Anti-burst properties]: Made from food-grade BPA-free plastic and fits the original brand perfectly, without any leaks. With its state-of-the-art technology, the whole house scale filter ensures a safe water use experience.
    • [Fast water flow]: With a continuous flow of filtered water at a stable pressure and a flow rate of up to 10 gpm, this water scale inhibitor is designed to provide water for your domestic requirements.
    • [reak-free and explosion proof housing]: The reinforced housing is made out of food-grade materials. It has been tested under 400 psi pressure without a crack or external dent.
    • [Extended lifespan]: Enjoy clean water by replacing your cartridge every 6 months, which will vary based on water conditions. Throughout this time frame, you will get maximum performance.
    • 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.
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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 service@waterdropfilter.com, 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 service@waterdropfilter.com, 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:

Email: service@waterdropfilter.com

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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Model number
Working temperature
40-100℉/ 4.4-38℃
Working pressure
30-125 psi/ 207-862 kPa
Flow rate
10 gpm/ 37.9 lpm

What is a scale inhibitor water treatment?

The scale inhibitor water treatment helps extend the life of downstream water-using appliances such as water heaters, washing machines and dishwashers, as well as plumbing fixtures like faucets, pipes and shower heads by reducing scale build-up and corrosion.

How does Waterdrop scale Inhibition mechanism work?

Waterdrop scale Inhibition mechanism contains polyphosphates to bind calcium and magnesium hardness minerals, preventing them from precipitating out and building up on metallic surfaces such as water heaters and plumbing fixtures like faucets, pipes and shower heads.

What causes scaling in water pipelines?

Scaling occurs when water has high levels of minerals like calcium or magnesium, which can build up on surfaces.

water scale inhibitor safe to use?

Our water scale inhibitor adopts food-grade BPA-free plastic. The integral structure is strong enough to resist burst. You don’t need to worry about leakage or damage.

Where do you install a scale inhibitor water filter?

The scale inhibitor water filter should be only connected with cold water valve, and it’s suggested to install it prior to your home water-using appliances.

How long does a Waterdrop scale inhibitor water filter last?

The scale inhibitor water filter has an extended life span of up to 6 months. Throughout this time frame, you will get maximum performance.

Is water scale harmful to our health?

In fact, water scale is not a health risk. Drinking a certain amount of hard water is generally safe. The nuisance lies in mineral buildup on fixtures, which leads to inefficiency.

What is a good water pressure for a scale inhibitor water filter?

The scale inhibitor water filter can normally work at a water pressure of 30-125 psi.
Replacement Model
Waterdrop W65
Protects Your Household Water Safety
Designed to prevent the accumulation of limescale and rust, thereby protecting your pipelines.
Prolongs the service life of your water-using appliances.
Fights Scale And Corrosion
By utilizing premium food-grade polyphosphates, our scale inhibitor water filter helps prevent the accumulation of limescale and rust along your household’s pipes.
Safe Materials
The cartridge housing is made from food-grade BPA-free plastic. With its state-of-the-art technology, the water scale inhibitor ensures a safe water use experience.
Strong And Consistent Water Flow
The whole house scale filter is designed to allow continuous water flow without a noticeable drop in pressure. It can achieve a flow rate of up to 10 gallons per minute.
Less Replacement Frequency
The water scale inhibitor features long life - up to 6 months, saving your replacement cost. You don't always have to remember when to replace.
Your Purchase Your Love
Invest in sustainability, lasting clean water, and improved health for children and their families.