Berkey® Water Filter FAQ | Filters, Use, Cleaning & Troubleshooting

Which Berkey® water filter should I buy?

The best system depends primarily on household size, countertop space, daily drinking-water use, and how often you want to refill the upper chamber.

These are practical starting points rather than strict rules. A two-person household that uses filtered water for cooking, coffee, tea, and pets, and uses reusable bottles, may prefer a larger system.

For dimensions, capacities, filter configurations, and recommendations, see our Berkey Water Filter Systems comparison guide.

What size Berkey® do I need?

Choose a capacity that comfortably supports your household's normal daily drinking and cooking needs without requiring constant refilling.

Consider:

• Number of people in the household
• How much drinking water you use each day
• Whether you also use filtered water for cooking, coffee, tea, or pets
• Available countertop height and width
• How frequently you want to refill the system

A slightly larger system may be more convenient if your household uses substantial quantities of filtered water throughout the day.

Do Berkey® systems require electricity or plumbing?

No. Stainless-steel Berkey® systems use gravity to move water through the installed filter elements.

They do not require:

• Electricity
• Batteries
• Household water pressure
• An under-sink connection
• Permanent plumbing installation

What comes with a new Berkey® system?

Package contents depend on the specific product listing and filter configuration.

A standard stainless-steel system generally includes:

• Upper stainless-steel chamber
• Lower stainless-steel chamber
• Stainless-steel lid
• Installed or included primary filter elements
• Standard spigot
• Washers and wing nuts
• Blocking plugs for unused filter openings
• Assembly components and instructions

Berkey PF-2® Fluoride and Arsenic Reduction Elements, stands, Water View™ Spigots, and other accessories are normally sold separately unless the listing specifically states otherwise.

What is a Berkey® water filter?

A Berkey® system is a countertop gravity-fed drinking-water filtration system. Water is poured into the upper chamber, moves through replaceable filter elements, and collects in the lower chamber for dispensing through the spigot.

The filtration performance depends on the specific filter elements installed, not simply on the stainless-steel chamber.

What does a Berkey® water filter reduce?

Performance depends on the exact elements installed. Black Berkey® and Phoenix Gravity elements have separate laboratory reports; results do not transfer between products or cover every substance in a contaminant family.

For a concern such as lead, PFAS, or a specific VOC, check the substance tested, starting concentration, final concentration, gallons tested, and certification claim. A high percentage alone does not establish that your treated water meets a drinking-water limit.

Review our filter test results and contaminants reference guide. Neither taste nor clarity proves that water is safe.

Does Berkey® reduce lead?

Published performance information for Berkey filter elements includes lead reduction testing. The specific result depends on the element being used.

For more information about lead sources, testing, and treatment, see our Lead in Drinking Water Guide.

Does Berkey® reduce PFAS?

Independent testing for Black Berkey® and Phoenix Gravity filter elements has evaluated reduction of selected PFAS compounds.

PFAS is a large chemical family, so a general statement such as “removes PFAS” can be misleading. Review the test results for the individual compounds and filter element you are considering.

See our PFAS in Drinking Water Guide for background information and the Phoenix Gravity vs. Black Berkey® Elements comparison for element-specific differences.

Does Berkey® reduce chlorine taste and odor?

Yes. Chlorine reduction is included in current performance information for Black Berkey® Elements and Phoenix Gravity New Millennium Edition™ Filters.

Phoenix Gravity filters are certified to NSF/ANSI Standard 42 for applicable aesthetic-effects claims.

Do Black Berkey® Elements reduce fluoride?

Black Berkey® Elements are not the dedicated fluoride filter in the Berkey system.

Customers specifically seeking additional fluoride reduction traditionally use Berkey PF-2® Fluoride and Arsenic Reduction Elements, which attach beneath compatible primary filter elements.

Review the Berkey PF-2® product instructions and compatibility information before installation.

What is the difference between Black Berkey® Elements and Berkey PF-2® Filters?

Black Berkey® Elements are primary gravity-fed filtration elements.

Berkey PF-2® Fluoride and Arsenic Reduction Elements are optional secondary filters that attach beneath compatible primary elements and are intended specifically for additional fluoride and arsenic reduction.

Berkey PF-2® Elements do not replace the primary filter elements.

What are Phoenix Gravity New Millennium Edition™ Filters?

Phoenix Gravity New Millennium Edition™ Filters are gravity filter elements designed for compatible Berkey® and similar gravity-fed systems.

They use premium CTC-60 coconut-shell activated carbon and have their own testing, specifications, filter-life guidance, and warranty.

They are a separate product from Black Berkey® Elements and should not be described as identical.

Are Phoenix Gravity filters compatible with Berkey® systems?

Phoenix Gravity New Millennium Edition™ Filters are designed for compatible stainless-steel Berkey® gravity systems and many similar gravity-fed systems.

Compatibility depends on the system and configuration, so review the Phoenix Gravity product page before ordering.

Are Phoenix Gravity filters NSF certified?

The Phoenix Gravity New Millennium Edition PGF9-2 element appears in NSF’s Standard 42 component listing for chlorine, taste, and odor reduction. The listing specifies a 4,000-liter test capacity and a 15–20-liter flushing procedure.

Complete systems have their own listings. Check the exact model and configuration; certification does not automatically cover every chamber paired with a listed component. NSF/ANSI/CAN 372 addresses lead content in materials, not removal of lead from water.

Separate laboratory reports for other contaminants are not NSF certification for those claims. See the official NSF listing and our test-results guide.

How are Phoenix Gravity filters different from Black Berkey® Elements?

They are different filter products.

They differ in areas such as:

• Filter-media formulation
• Published test results
• Certification status
• Rated capacity
• Warranty
• Recommended source-water applications

Compare the documentation for the exact filter element rather than assuming performance carries over from one filter to another.

Why does my TDS meter reading stay about the same after filtration?

A TDS meter measures the electrical conductivity associated with dissolved ions. Minerals such as calcium, magnesium, sodium, and bicarbonate contribute to the reading.

Gravity-fed Berkey® filtration does not work like reverse osmosis or distillation, which substantially reduce dissolved mineral content.

As a result, the TDS reading may remain similar before and after filtration. For a fuller explanation, see Acceptable TDS Levels in Drinking Water.

Can I use a Berkey® system with well water?

Have the well tested and select treatment for the results before relying on a countertop filter. Include microbial testing and locally relevant contaminants; a clear appearance does not establish safety.

Phoenix Gravity guidance is for treated municipal water; do not assume it disinfects untreated well, lake, or stream water. For any element, confirm that its instructions permit your source water and that treatment addresses the contaminants found. Sediment or other well conditions may require additional treatment.

See our well-water testing and treatment guide.

Can I use softened or salt water?

Do not use softened or salt water with Phoenix Gravity elements. The manufacturer’s instructions warn that this can clog the pores and void the warranty. Follow the source-water restrictions for Black Berkey® Elements as well; use a suitable supply before ion-exchange softening where applicable.

These gravity filters are not desalination systems. They do not turn seawater into drinking water or reliably remove sodium added by a softener.

How fast does a Berkey® system filter water?

Flow rate depends on:

• System size
• Number of installed elements
• Filter model
• Water level in the upper chamber
• Priming quality
• Filter cleanliness
• Water temperature

Gravity systems filter fastest when the upper chamber is full because the additional water creates greater pressure above the filter elements.

Adding compatible elements to systems that support additional filters can increase total flow.

The upper chamber does not drain completely. Is that normal?

Yes. A small amount of water may remain in the upper chamber.

As the water level falls, gravitational pressure decreases, and flow becomes progressively slower. This is normal for a gravity-fed system.

How long can filtered water remain in the Berkey® system?

For everyday use, rotate the water regularly rather than allowing it to remain unused for long periods.

If the system will not be used for several days, empty and clean it as appropriate. Water intended for long-term storage should be placed in a clean container designed for drinking-water storage and handled in accordance with appropriate storage practices.

Why shouldn't filter elements be allowed to freeze?

Water expands when it freezes. Moisture trapped inside a filter element can therefore damage the internal structure.

If a used filter has frozen, do not assume that it remains unaffected simply because the outside looks normal.

What should I do before using new filters?

Identify the element model, then follow its priming and flushing directions before drinking the water. Assemble washers, nuts, and unused-hole plugs as illustrated. Hand-tighten only; avoid damaging stems.

For Phoenix elements, use the current manufacturer manual alongside the flushing requirement in the NSF listing. PF-2 filters require their own preparation.

Can I use the system during a drinking-water advisory?

Follow your water utility or health department’s instructions, even if you use a filter. During a boil-water advisory, filtration alone is not a substitute for the required boiling step. During a chemical “do not drink” or “do not use” advisory, use the approved alternative supply; boiling can be inappropriate.

Do not pour boiling water into the system. Ask the issuing authority when normal use may resume and whether equipment needs cleaning or filters need replacement. See CDC drinking-water advisory guidance.

How long do Black Berkey® Elements last?

The published nominal capacity is approximately 3,000 gallons per element, or 6,000 gallons per pair. Actual service life depends on water quality, use, and maintenance.

This is not a promise that every tested contaminant is reduced for 6,000 gallons. Track use and follow the element instructions. Where a particular contaminant is a concern, use its performance evidence and appropriate treated-water testing to guide replacement.

How do I know when to replace Black Berkey® Elements?

Consider replacement when:

• The rated gallon capacity has been reached.
• The element is physically damaged.
• Performance is in question after correct troubleshooting.
• Flow remains poor after cleaning and re-priming.

Slow flow by itself does not always mean the element is exhausted. Inadequate priming or surface buildup can also reduce flow.

Can I replace only one Black Berkey® Element?

Where possible, replacing elements as a matched pair provides more consistent age, flow, and service history across the system.

If only one element is being replaced, keep accurate records of when each filter entered service and its estimated gallons processed.

How long do Phoenix Gravity filters last?

The published nominal capacity is 2,750 gallons per element, or 5,500 gallons per pair. Water quality and maintenance affect useful life.

The nominal capacity differs from NSF’s listed chlorine test capacity and from the volumes evaluated in separate contaminant reports. Do not treat 5,500 gallons as a certified capacity for every contaminant. See the Phoenix product specifications and test evidence.

How often should I replace Berkey PF-2® filters?

Our current replacement guidance is 1,000 gallons per pair or one year, whichever comes first. Replace sooner if source-water conditions or performance warrant it. Record the installation date and estimate gallons processed.

PF-2 filters have a separate replacement schedule from the primary elements. Fluoride performance depends on water chemistry, including pH and competing substances. See the PF-2 product guidance.

Can I wash Black Berkey® Elements with soap?

No. Do not apply soap or detergent to Black Berkey® Elements.

If flow has slowed, the exterior can be gently cleaned under cool running water using a new Scotch-Brite®-type pad or similar recommended cleaning pad. Re-prime the elements before returning them to service when necessary.

How should I clean the stainless-steel chambers?

Remove the filter elements first. Wash the chambers with mild dish soap and warm water, then rinse thoroughly. Clean the spigot and its contact surfaces following the accessory instructions.

For mineral scale, use the chamber manufacturer’s recommended vinegar-cleaning method. Keep soap and chamber-cleaning solutions away from filter media; each element has its own cleaning procedure.

Can I mix Black Berkey® and Phoenix elements?

Use a matched, manufacturer-supported configuration. Physical fit does not establish equivalent flow, life, or certified performance. Check with support before mixing models, and do not transfer one model’s test results to a mixed setup.

How do I clean or store Phoenix Gravity elements?

Clean the exterior under cold running water with the brush or pad specified in the Phoenix instructions, then re-prime. Never freeze wet elements.

For 4–15 days without use, the manual specifies damp storage in a sealed bag in the refrigerator. For longer storage, dry completely before sealing and keep away from odors. Re-prime before reuse.

Where can I check replacement-filter availability?

Use our replacement-filter page to check Black Berkey® availability and compare Phoenix Gravity, PF-2, and Sport Berkey replacements. Stock and permitted destinations can change. Match the replacement to your system and source water; Sport bottle filters are not interchangeable with countertop elements.

Why is my Berkey® filtering slowly?

Common causes include:

• Incomplete priming
• Air trapped inside the filter pores
• Surface buildup
• A low upper-chamber water level
• Very cold water
• High sediment loading
• An older filter nearing its service capacity

Start by checking the priming and cleaning instructions for the specific filter element installed in your system. See How to Prime Berkey Filter Elements and Why Is My Berkey Filtering Slowly? for step-by-step guidance.

Why does my Berkey® water taste unusual?

New filter elements can require thorough priming and flushing before normal use.

If an unusual taste occurs:

1. Confirm that the filter was correctly primed.
2. Flush according to the filter instructions.
3. Clean and rinse the chambers.
4. Confirm that the source water itself has not changed.

If the taste persists, contact customer support before continuing to use the system.

Why do I see black residue after priming?

Fine carbon particles can be released from new carbon-containing filter media during initial priming or flushing.

Continue priming and flushing according to the instructions until the water runs clear.

What does the red food coloring test tell me?

It is an assembly and bypass check described in Black Berkey® instructions and the current Phoenix Gravity manual. Follow the directions for your exact element, including the specified dye, dose, and accessory removal. Remove PF-2 elements when instructed.

Passing this check does not prove microbiological safety, certify removal of every contaminant, or measure remaining filter life. If colored water passes through, stop using the system until the cause is resolved.

See our red food coloring test guide.

My Berkey® spigot leaks. What should I do?

First determine exactly where the leak originates.

Check:

• Washer placement
• Nut tightness
• Spigot orientation
• The valve itself
• Any cracks or damage

Do not overtighten components with excessive force. If the spigot continues to leak after correct assembly, contact customer support or replace the affected component.

Why is water leaking between the chambers?

The lower chamber may be overfilled. These systems do not automatically stop filtration when it is full. Before adding water, check the lower chamber and add no more than its available space can hold, accounting for water still filtering above.

Empty excess water, dry the outside, and locate the leak. If it continues without overfilling, inspect assembly and contact support.

What Berkey® accessories are most popular?

Common accessories include:

• Replacement filter elements
• PF-2™ Fluoride and Arsenic Reduction Filters
• Water View™ Spigot
• Berkey® Wire Stand
• Stainless-steel spigots and other accessories

What does the Berkey® Water View™ Spigot do?

The Water View™ Spigot combines a dispensing spigot with an external sight tube that shows the approximate water level in the lower chamber.

This can be convenient because you do not need to lift the upper chamber to estimate how much filtered water remains.

Do I need a Berkey® stand?

No. A stand is optional.

Many users prefer one because it raises the spigot above the countertop, providing more clearance for glasses, bottles, and pitchers.

How should I store Black Berkey® Elements?

For long-term storage, used Black Berkey® Elements should be cleaned as appropriate and allowed to dry completely before being placed into a clean sealed storage bag.

Store dry elements away from:

• Smoke
• Perfumes
• Cleaning chemicals
• Fuel
• Strong odors

Re-prime the elements according to the manufacturer's instructions before returning them to service.

How should filtered water be stored?

Store water in a clean, covered container appropriate for drinking water.

For normal household use, rotate stored water regularly and avoid unnecessary exposure to heat, sunlight, dirty utensils, or contaminated containers.

If you are storing water for extended periods, follow recognized drinking-water storage guidance appropriate to the storage purpose and container.

What type of stainless steel is used for Berkey® systems?

The stainless-steel Berkey® systems use polished AISI 304 stainless steel.

AISI 304 is widely used for food- and beverage-contact equipment because of its durability and corrosion resistance.

What are Black Berkey® Elements made from?

Black Berkey® Elements use a proprietary blend of filtration media, including carbonized coconut-shell material, formed into a gravity-fed filtration element.

Because the full formulation is proprietary, avoid relying on unofficial ingredient lists that claim to disclose every component.

Do Black Berkey® Elements contain graphene oxide?

Manufacturer information states that Black Berkey® Elements do not contain graphene oxide.

How much is shipping?

Qualifying orders over $199 ship free to the lower 48 states. Check checkout and our shipping policy for applicable charges.

How long does order processing take?

Normal processing is 3–7 business days after payment. Carrier transit adds time; this is not a delivery guarantee.

Do you ship internationally?

No. TheBerkey.com currently does not ship internationally.

Can I cancel or change an order?

Call (888) 899-3903 promptly. Email requests cannot be processed. Changes depend on whether shipping processing has begun and are not guaranteed.

Can I return a product?

Change-of-mind and wrong-size returns are not accepted. Qualifying damaged, defective, missing, or incorrect orders may receive a remedy. Get authorization before returning anything; see our full policy.

What if my order is damaged, missing, incorrect, or defective?

Report damage or missing items within 10 business days of delivery. Request replacement of incorrect or defective items within 30 days of receipt. Qualifying refund requests have a 10-business-day deadline. Keep packaging and photos; warranty rights may continue beyond these periods.

Are there state shipping restrictions?

Certain products are unavailable in California and Iowa. Confirm eligibility for the exact item and destination before ordering.