Compatibility can be confirmed visually.

• Open your cooler and compare your current filters to the product photos on our website. If the filter style and connection type match, your system uses standard inline filters and will be compatible with our replacements.

• If your system uses proprietary twist-on cartridges (examples shown below), the filters will appear noticeably different than standard inline filters. Twist-On filters (typically) have no filter port on the bottom and they hang from a manifold.
• We do not carry compatible replacements for twist-on systems.

• Note for Wellsys® users: Wellsys® has both filter styles. Some of their systems use standard inline filters (compatible with our replacements), while others use proprietary twist-on cartridges (not compatible with our replacements). Model name, number, or age alone isn’t a reliable indicator of filter type.

• If you’re still unsure which style your unit uses, please contact us. We are always happy to answer questions and confirm compatibility.

Example images of some twist-on filters shown below for reference (not compatible with our filters).

UF and RO membranes are not interchangeable within the system’s original configuration. When selecting your replacement filter set, you should select the same membrane that you already have.

To identify your membrane:

• Standard inline UF membranes have two ports (one inlet and one outlet).

• Standard inline RO membranes have three ports — one inlet on one end and two ports on the opposite end (a purified water outlet and reject water outlet).

If you have a membrane filter in your system that has three ports, your system is configured as Reverse Osmosis.

Choose based on what is currently installed in your system.

• If your cooler has four cartridges installed, choose the 4-filter set.
• If your cooler has five cartridges installed, choose the 5-filter set.

If you’re unsure, open the filter compartment and count the cartridges. Feel free to contact us with photos of the inside of your unit and we'll be happy to confirm.

No-tool fittings are direct replacements for standard 1/4" push-fit elbow fittings. They perform the same function but feature a patented pull-tab design that makes disconnecting the fitting from the filter port quick and easy.

In most cases, they are not required if your system already uses standard 1/4" push-fit fittings. You can typically reuse your existing fittings.

However, many customers choose to upgrade because no-tool fittings make future annual filter changes faster and more convenient — especially when removing filters from tight spaces.

They may be required if your system uses a different connection style or if you are transitioning from a factory configuration that does not use standard 1/4" push-fit fittings.

If you’re unsure whether you need them, contact us and we’ll be happy to confirm before you order.

No. Most customers complete their annual filter replacement themselves in 20-30 minutes.

If your system uses standard inline filters, installation is straightforward and does not require specialized tools or professional service. The process typically involves turning off the water, disconnecting the existing filters, reconnecting the new ones, and flushing them.

We provide clear written instructions and video guides to support the process.

If you’re ever unsure, we’re happy to review photos or answer questions before or during.

For most home and office use, we recommend replacing your full filter set once every 12 months to maintain optimal performance, water quality, and flow rate.

If your water supply is high in chlorine or sediment, the pre-filters (#1 sediment filter and #2 pre carbon filter) may require replacement every 6 months.

If you notice reduced flow or changes in taste, earlier replacement may be necessary.

For convenience, we've included an optional Subscribe & Save auto-ship selection for our filter sets so you never have to worry about remembering to replace them.

Orders placed during business hours (Eastern Time) are typically processed and shipped within 24 hours. You’ll receive tracking information as soon as your order is on its way.

We offer free shipping on orders over $55 within the mainland United States. Orders under $55 ship for a flat $12.99 rate.

We currently ship within the mainland United States only.

We do not offer international shipping at this time.

We offer subscription options for select products to simplify routine filter replacement and provide automatic savings (10% off).

• Pre-Filter sets are available on 6-month or 12-month subscription schedules.

• Complete 4-filter sets and 5-filter sets are available on a 12-month subscription schedule.

• When you purchase the RainTree™ Undersink System using the subscription option:

• Your FIRST SHIPMENT will include the Raintree™ Undersink System with pre-installed filters (10% off).

• Your FUTURE SHIPMENTS will include an annual 4-Filter UF Replacement Set (10% off).

• The replacement filters you receive will match the configuration selected with your original system purchase (Post Carbon or Alkaline Mineral version). If at any time you decide you would like to receive the other filter set version, you can change this yourself in your account or you can contact us and we will be happy to do it for you.

Absolutely. You can modify, skip, or cancel your subscription at any time through your account.

There are no contracts or long-term commitments beyond the current shipment.

You will receive a welcome email when you first subscribe and you will receive email notifications prior to every shipment to inform you about your upcoming delivery. This will allow plenty of time to edit your filter selection, skip shipments, change shipment dates, or cancel your subscription.

If you need assistance, contact us and we’ll be happy to help.