How-To Setup legacy.

Simple and straightforward instructions for setting up the BOROUX legacy water filter system. We'll lead you through the setup process one step at a time. Set up and start enjoying your filtered water!

What's in the box

legacy. system

  1. Lid
  2. Upper chamber
  3. Lower chamber
  4. Stainless steel spigot
  5. Hole plug
  6. Silicone base ring

foundation. filters

  1. Two BOROUX foundation filters
  2. Blue priming tool
  3. Tan priming tool
  4. Vial of red dye solution

How to set up the BOROUX legacy water filter system

Assemble the system

Install hole plugs

  • Unscrew the washers and the wingnut from each hole plug.
  • Place a washer on the inside and outside of a hole in the upper chamber. Thread the plug through the hole.
  • Screw the wingnut into the base of the plug.
  • Hand tighten until secure.
  • Repeat the process with the second plug and install the plug in a hole diagonal from the first to evenly distribute the weight of the filters once they are installed.

Attach base ring

  • Attach the silicone base ring to the lower chamber.
  • There is a notch in the ring that should be placed below the empty spigot hole.
  • The silicone base ring prevents slipping and keeps the system stable on surfaces.

Attach spigot

  • Remove the wingnut, the two stainless steel washers, and the two silicone washers from the spigot body.
  • Thread one stainless steel washer onto the spigot, positioning it so that the beveled side faces away from the lower chamber, as shown.
  • Thread a silicone washer onto the spigot.
  • Insert the spigot through the hole in the lower chamber.
  • Thread the remaining silicone and stainless steel washers onto the spigot inside the lower chamber, positioning it so that the beveled side of the metal washer faces away from the hole, as shown.
  • Thread the wingnut onto the spigot, securing it in place.
  • After tightening the wingnut, make sure the outside metal washer is not pinching the silicon base ring.
  • Move the spigot handle to the closed position, as shown.

Prime your foundation filters

boroux foundation filter

Step 1

Remove the wingnut and washer from each BOROUX filter.

boroux blue silicone primer

Step 2

Attach the blue silicone priming tool to the faucet, making sure you pull the primer up as far as possible to create a good seal with the water spout.

priming flow rate

Step 3

Adjust the water flow so that a 12 oz cup fills within 45 to 60 seconds. Important: Use only cold water.

inserting foundation filter into primer

Step 4

While the water is flowing, gently push the stem of the BOROUX filter into the blue primer.

foundation filter in primer

Step 5

If the blue primer inflates as shown above, or if there is excessive water leakage around the primer, re-adjust the water flow so that a 12 oz. cup fills within 45 to 60 seconds.

foundation filter primed

Step 6

After 1 to 2 minutes, water will be visible on the filter surface Continue to prime for 1 to 2 more minutes, until water beads on the entire filter surface.

dripping foundation filter

Step 7

Keep water flow running. Remove the filter from the primer. Set the filter aside on a clean surface.

primed boroux filter

Step 8

Repeat the priming process for each BOROUX filter (steps 4 through 7).

Install filters in legacy system

Step 1

Thread the rubber washer onto the stem of each BOROUX filter.

Step 2

Insert the stem of the filter into an empty hole on the inside of the upper chamber. Repeat for each filter.

Step 3

On the outside of the chamber, thread the wingnut onto the filter stem and hand tighten until secure. Repeat for each filter. Important: Do not over-tighten.

Step 4

On the outside of the chamber, thread the wingnut onto the filter stem and hand tighten until secure. Repeat for each filter. Important: Do not over-tighten.

Perform the red dye test to verify correct installation

The red dye test serves as a diagnostic tool to determine whether the filters are installed properly. This procedure works by pouring red-dyed water through the filters to determine if any red-tinted water is visible after it goes through. Best practice is to perform this test upon receiving new filters and before use. If filters fail the test, we’re here to help!

Please use the red dye provided, or McCormick's artificial liquid red food coloring. Alternative dyes and gels, especially those labeled as natural, may contain minerals and natural colors that could bypass the filters, potentially yielding inaccurate results.

Before proceeding with the test, it is imperative to confirm that the washer and wingnut of the filters are correctly positioned. The washer should be located inside the upper chamber, while the wingnut should be fastened beneath the upper chamber.

Step 1

Important: If you installed fluoride filters, remove them before beginning a dye test. Set them aside on a clean surface. The lower water chamber should also be set aside on a clean surface.

Fill the upper chamber with a few inches of water and check that water does not leak from any hole plug. Once you have verified there are no leaks, pour out the water from the upper chamber.

Step 2

Place a sturdy, equal-sized clear glass under each black filter stem. A pint-sized (16 oz) canning jar is ideal. Important: Each filter must have its own glass. Do not use a receptacle that covers both filter stems.

Step 3

In a separate container, add 1/8 of a teaspoon of dye per gallon of water. Mix thoroughly.
Note: Each vial of red food dye contains one teaspoon of dye. Most upper chamber sizes will require two gallons of the dye solution to test.

Step 4

Pour the dye solution into the upper chamber until the BOROUX filters are completely submerged.
Caution: Never pour red dye directly from the vial onto the filters or into the upper chamber.
Always pre-mix the dye with water in a separate container.

Step 5

Allow the water to filter from the upper chamber into the glasses below. When the glasses are 3/4 full, dump the remaining water out of the upper chamber.
Note: The glasses may fill at slightly different rates.

Step 6

Examine the water in each glass. It should be clear without any pink or red tint. If the water is not clear, make sure that the washer on that filter is in the correct location and that the wingnut is securely tightened. Repeat the red dye test.
Note: If a filter fails a second dye test, email

Frequently Asked Questions

How to prime with the tan priming tool?

The complimentary tan priming tool looks like a thick washer. It funnels water into the interior of the filter and forces water through the media to fully saturate it.

  1. Place the washer, wingnut, and tan priming button on the stem of the filter.
  2. Press the priming button up against the faucet. Hold the stem between two fingers, and use the wingnut for grip.
  3. Slowly turn on the water until it reaches a low but consistent flow, and be sure to use cold water.
  4. Let water run through the filter for approximately one minute. A good indicator that the filter is fully primed is if you can see small beads of water appearing on the sides of the filter.
  5. Turn off the water and remove the filter from the priming button. Your filter is now primed!
How to prime by soaking?

An alternative method is to soak the filters overnight. It’s ideal for situations when water pressure is not adequate, or if the priming tools don't fit with your faucet. This method is not recommended after cleaning the filters because water pressure is needed to flush out particles. This method saturates the filter media from the outside in, drawing water from the exterior through the pores to the inside. 

  1. Place the filters with the stems up in a large enough container to fully cover the filters with water. 
  2. Fill the container with water. 
  3. Soak overnight, or for at least eight hours.
  4. To determine if the filters are fully primed; if filters float, they need to be soaked longer, if they sink, they are primed.


Why do the filters have to be primed?

Priming the BOROUX filters is necessary for proper function. This procedure is what activates the carbon and breaks the surface tension, so that the contaminants get trapped, and the water gets through. The filter is made of very dense material and priming forces water through the material so that it’s entirely saturated. This is a crucial initial step for using the filters. 

The media that the BOROUX filter is made of has a micropore structure. These micropores are miniscule which can create tiny pockets of air. Along with the high surface tension of the filter material, without being primed first, water cannot pass through those air bubbles. Priming uses water pressure to force water through those micropores so that when water is passing through only using gravity, it can. If the filters are not primed, the flow can be extremely slow, if not completely nonexistent.

What if I don’t see beads of water on my filter when priming?

Each filter is unique, some filters shows lots of water beads, others do not. As long as the filter is fully saturated, they are primed. Running water through the filter for 1-2 minutes fully saturates the filter.

What happens if the filters fail the red dye test?

For a failed red dye test, double check these variables:

  1. Do not pour dye directly onto the filters, it will overwhelm them.
  2. Use the correct type of dye. It must be red, artificial liquid. Natural dyes contain minerals that pass through the filters. Gel food coloring should NOT be used because it is too viscous, it won’t result in accurate results. 
  3. Confirm a tight seal between the base of the filter and the upper chamber so that the only water getting through is going through the filter, not leaking through the hole. The washer should be on the stem of the black filter inside the upper chamber, and the wingnut should be secured on the filter stem on the underside of the upper chamber.  Wingnuts should only be hand tightened. Do not use tools to tighten. If the wingnuts are too tight the stem threads could be damaged. 
  4. If re-testing a filter; rinse the filter, rinse the glasses or jars, prime the filters again, and then redo the test.
When and how to do maintenance?
  1. Remove foundation filters: Take out the filters and place them in a safe spot to avoid any damage. 
  2. Wash the Chambers: Using warm water and a mild dishwashing soap, wash the chambers, parts, and pieces by hand. Or, place the stainless steel chambers in the dishwasher.
    Optional remove the spigot: If needed, detach the spigot from the lower chamber for cleaning. DO NOT use soap on the foundation filters.
  3. Reassemble and enjoy: Once dry, reassemble your BOROUX legacy system and continue to enjoy refreshing water. Happy hydrating! 

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