The most common cause of extremely slow or no flow in a new system is high water surface tension, which prevents air from being purged from the microscopic pores of the filter elements. New elements arrive dry with air trapped inside those pores. Until that air is displaced by priming, it blocks water from passing through.

The fix: Remove your filter elements, prime them using the priming button or prime-rite tool included in the box, reinstall them, and refill the upper chamber. This resolves the problem in the vast majority of cases.

Yes. The priming button is easy to confuse with a standard washer because it looks similar at a glance. Look for these differences: the priming button is thicker than the flat rubber washers, and its center hole is smaller.

Your element box should contain: two filter elements, one rubber washer and one wing nut attached to each element, and one separate thicker disc — that is your priming button.

Use the submersion method when tap pressure is unavailable. This achieves approximately 75–80% of the effectiveness of button-priming - your flow rate will be noticeably better than unprimed, though not quite as fast as fully button-primed elements.

1. Fill the lower chamber with water.
2. Remove the filter elements from the upper chamber.
3. Place the elements upside down in the lower chamber water - stems facing upward. Weigh them down with a ceramic cup or similar object so they stay fully submerged. Keep the stem openings above the water lineYou want water forced through the pores, not entering through the stem bore.
4. Let them soak for several hoursThe water pressure from submersion forces water through the pores from the outside, displacing trapped air.
5. Reassemble with stems pointing upward to retain the water inside the elements. Empty the lower chamber, stack the chambers, and immediately fill the upper chamber with water.
6. The water inside the element bore creates a siphon effect — in addition to gravity pushing water through, hydraulic pull from the bore pulls more water in, which significantly improves flow through stubborn pores.
7. Run the first filtered output to waste. Your elements are now ready for use.

Use the red food coloring test — the definitive pass/fail check for proper element seating and filtration integrity.

1. Add one tablespoon of red food coloring per gallon of water to the upper chamber.
2. Let the system filter normally.
3. Check the lower chamber water. If it is completely clear- the system is working correctly.
4. If the lower chamber water is tinted red - the elements are not correctly seated. Tighten the wing nuts firmly and repeat the test.

Perform this test after any of the following: new element installation, element re-cleaning, reinstallation after travel, or any time you have a reason to question the system's performance.

White floaters are not bacteria - they are precipitated minerals (most likely calcium) that were already present in your source water, now made visible.

When Berkey elements filter water they slightly raise its pH toward alkaline. As pH rises, the water's ability to keep certain minerals suspended in ionic form decreases, and those minerals begin to precipitate out - a process called flocculation. Depending on mineral composition, they either sink as sediment or float on the surface. Boiling and freezing accelerate this precipitation visually.

This is most common with hard water high in calcium and magnesium. The minerals were in your water before filtration - they are simply now visible. This is not a filtration failure and is not harmful.

No, a stable TDS reading is expected and correct. A TDS meter measures only Total Dissolved Solids, which are dissolved minerals in ionic form. Berkey elements are specifically designed to leave beneficial minerals in the water (calcium, magnesium, potassium) while removing harmful contaminants. Because the minerals stay, the TDS reading stays approximately the same unless you have heavy metals like lead or mercury in your water.

Critically, TDS meters do not detect: pharmaceuticals, PFAS/PFOA/PFOS, pesticides, herbicides, chlorine, chloramines, etc - the contaminants Berkey is built to remove. A stable TDS reading does not provide insight as to how the filters are performing but rather that they are most likely performing as designed. 

Yes, this is completely normal. It is common for the last ½" to 2" of water to remain in the upper chamber. As the water level drops, the gravitational pressure available to push water through the microscopic filter pores decreases. At very low water levels there is simply not enough head pressure to drive the remaining water through.

That residual water mixes with the next refill cycle and is fully filtered - during normal daily use this requires no action. If you will be away for more than a few days, empty the lower chamber before leaving to prevent stagnation.

The answer depends on the type of taste or smell:

• Carbon or earthy taste - new system: Normal for new activated carbon elements. Run 2–3 complete break-in fill cycles before regular use. The taste clears quickly.
• Rubber or metallic taste: Clean the spigot, all rubber washers, and the stainless steel chambers with warm water. Do not use soap on or near the filter elements themselves.
• Musty or stale smell: Likely caused by sitting unused with water inside. Drain both chambers completely, clean the stainless steel with warm water, remove and re-prime the elements before restarting.
• Persistent chemical taste: Compare your filtered water against a glass of your unfiltered source water directly. If the source water tastes the same, the issue is in your source - not the filter. Options include adding PF-2 elements for fluoride or a sediment pre-filter for heavily particulate source water.

1. Remove the elements from the upper chamber.
2. Under running water, gently scrub the exterior surface with a non-metallic scrubbing pad (such as a Scotch-Brite pad) using a circular motion. This removes the accumulated biofilm layer — the primary cause of reduced flow rate over time.
3. Do not use soap, bleach, or any cleaning agent on the filter media. These damage the activated carbon and compromise the filter's performance.
4. Rinse the hollow bore (stem) with clean water.
5. Re-prime the elements before reinstalling - cleaning partially opens pores and priming ensures full flow rate is restored.
6. Reinstall and run the red food coloring test to confirm proper seating before returning to regular use.

Replace based on gallons filtered, not time elapsed:

• Phoenix Gravity New Millennium Edition™ Elements: 2,750 gallons per element - 5,500 gallons per set of two
• Black Berkey® Elements: 3,000 gallons per element - 6,000 gallons per set of two

To estimate your remaining life: divide the rated capacity by your estimated daily filtered water usage in gallons. For example, a household filtering 1.5 gallons per day through a set of Phoenix elements has approximately 3,650 days (10 years) of use before replacement.

The red food coloring test is the definitive functional check - if the lower chamber water is tinted red after the test, replace the elements regardless of calculated usage. Time alone is not a reliable indicator; elements stored dry can remain viable for years.

For storage periods longer than 1-2 weeks:

1. Empty both chambers completely.
2. Remove the filter elements.
3. Let them dry 
   Allow elements to air-dry completely in a clean, open environment before storing. A windowsill with sun really helps.  A partially dried element stored in a sealed space can develop mold.
4. Clean the stainless steel chambers with warm water and dry thoroughly before storing.

When restarting after extended storage: You may need to re-prime the elements if they were stored dry, run one break-in fill cycle to waste, and perform the red food coloring test before returning to regular use.

Identify the leak source before attempting a fix. Common locations:

• Element stem holes (upper chamber floor): Wing nuts are not tight enough. Hand-tighten firmly until snug - do not use tools. Retest with the red food coloring test.
• Spigot: The rubber washer inside the lower chamber may be loose or misaligned. Unscrew the spigot, confirm the washer is seated flat against the inside chamber wall, and retighten. If the washer is cracked or deformed, contact us - spigot and washer replacements are free under our lifetime hardware warranty.
• Between the upper and lower chambers: The chambers sit on top of each other and do not form a sealed connection by design. Water appearing between them is from splashing during filling, not a seal failure. This is normal.
• Under the lower chamber: Inspect the spigot first. If the spigot is dry and the leak continues, check the lower chamber for physical damage — contact us for a replacement chamber.

No. Activated alumina and aluminum are chemically distinct materials. Activated alumina is oxidized aluminum - aluminum that has bonded with oxygen - and is considered inert. It is used in toothpaste and many food-contact applications and is not regulated the same way metallic or ionic aluminum is.

Aluminum in metallic or ionic form can cross the blood-brain barrier; oxidized alumina does not behave the same way. Because fluoride is a byproduct of aluminum production, it has a natural chemical affinity to recombine with activated alumina - which is exactly what makes it the most effective extraction medium for fluoride and arsenic removal.

Independent testing of water run through both Black Berkey elements and PF-2 elements showed a net reduction in tested aluminum content compared to the source water. This testing did not distinguish between aluminum and alumina, so the result represents a combined measurement - and it still showed net reduction.

Yes. The activated alumina media in PF-2 elements performs best at a pH of approximately 6.0. When source water pH rises above 8.0, the media's ability to adsorb fluoride and arsenic decreases.

If your source water has significantly high or low pH, PF-2 elements will still provide meaningful reduction but at reduced efficiency. Most municipal tap water falls within an acceptable pH range for normal PF-2 performance.