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Replacement calculator

Pitcher Water Filter Replacement Calculator

Estimate how often to replace your pitcher water filter based on filter type, household size, water hardness, and daily usage.

60days

Typical

Your schedule

Under typical conditions, replace your Standard pitcher filter every 2 months, or an Elite filter every 6 months.

Use the inputs below to tailor this for your filter type, household size, water hardness, and daily water use.

  • Filter type is the biggest factor — Elite/Longlast filters last 3× longer than Standard.
  • Hard water shortens filter life significantly, especially for ZeroWater filters.
  • Larger households go through more water daily, reaching the gallon limit sooner.
  • Heavy use (large pitchers refilled multiple times a day) can cut the interval in half.

Recommended replacements

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Inputs

How to identify your filter
  • Standard Brita filters are white. Elite/Longlast filters are blue.
  • ZeroWater filters are grey/blue with a 5-stage label.
  • PUR filters are typically labeled on the cartridge itself.
How to check water hardness
  • ZeroWater includes a TDS meter — high readings (200+ ppm) indicate hard water.
  • Look for white scale on faucets and kettles — that's mineral buildup from hard water.
  • Your local water utility's annual water quality report will list hardness levels.

How many gallons does a pitcher filter last?

Pitcher filters are rated in gallons first and months second. The month figure is only an estimate of how long a typical household takes to pour that many gallons through.

  • Brita Standard (white): 40 gallons, about 2 months.
  • Brita Elite (blue, formerly Longlast): 120 gallons, about 6 months.
  • PUR and PUR PLUS pitcher filters: 40 gallons or 2 months, whichever comes first.
  • ZeroWater: no fixed gallon rating. Replace when the included TDS meter reads 006 on filtered water.

Turning gallons into your own schedule

Divide the rating by what your household actually pours through the pitcher each day. If three people each drink and cook with about half a gallon a day, that's 1.5 gallons a day, so a 40-gallon filter lasts under four weeks, not eight.

Light users hit the calendar limit first. Heavy users hit the gallon limit first. The calculator estimates which comes first for your household.

Why ZeroWater filters run out faster in some homes

ZeroWater filters remove nearly all dissolved solids, so their life depends on how many dissolved solids your tap water starts with. ZeroWater recommends testing often, about every other day, when tap water reads above 300 on the meter, because the filter will need changing sooner.

Push past 006 and the water can start to taste sour or fishy. That's the filter telling you it's done.

FAQ

How often should I replace my Brita pitcher filter?

Standard Brita filters are rated for 40 gallons, which works out to about 2 months for an average household. Elite (Longlast) filters are rated for 120 gallons — about 6 months. If your household uses more water or has hard water, you may hit the gallon limit before the time limit.

Why does ZeroWater need to be replaced so much more often?

ZeroWater uses a 5-stage ion-exchange filter that removes virtually all dissolved solids. That thoroughness comes at a cost — the filter media exhausts quickly, especially with hard water high in TDS. Use the included TDS meter to check: when readings climb above 6 ppm, it's time to replace. Waiting too long can cause the filter to release contaminants back into the water.

Is the time-based schedule or the gallon limit more accurate?

Gallons filtered is the more meaningful measure — the time limit is a safety backstop for households that use the pitcher infrequently. If your household uses the pitcher heavily, you'll hit the gallon limit before the time limit. This calculator estimates when that's likely to happen based on your usage level.

Does hard water really shorten filter life?

Yes, significantly. Calcium and magnesium in hard water take up filtration capacity, exhausting the filter media sooner. This matters most for ZeroWater, which removes minerals aggressively. For Brita and PUR, hard water has a moderate effect on taste filtration but a smaller effect on overall filter life compared to ZeroWater.

Sources

Last reviewed .How these estimates are made.

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