As an Amazon Associate I earn from qualifying purchases.Updated: March 19, 2026
The Brita Longlast+ OBL21 uses a specialized Longlast Filter to reduce impurities in your drinking water. Over time, this filter becomes less effective at removing contaminants, leading to slower filtration speeds and potentially reduced water quality. Replacing the filter every 6 months ensures optimal performance and continues to provide clean, safe drinking water.
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Function: The Longlast Filter removes impurities from your tap water, improving taste and odor.
Signs it needs replacing: Reduced water flow rate, noticeable changes in water taste or odor.
OEM vs aftermarket: OEM filters (Brita branded) are generally more expensive but often have stricter quality control. Aftermarket options can be a cost-effective alternative but research reviews carefully for compatibility and performance.
Installation: Typically involves twisting the old filter out and inserting the new one. Refer to your Brita Longlast+ OBL21 user manual for specific instructions.
Replacement schedule: every 6 months
Compatibility warning: always verify part number matches your exact model before ordering
Pros & Cons
Pros
✓ Restores device to original performance without buying a new unit
✓ Significantly cheaper than a full device replacement
✓ Multiple options available from OEM and aftermarket sellers
Cons
✗ OEM parts cost more than third-party alternatives
✗ Wrong part number will not fit — model verification is essential
Common Use Cases
Scheduled maintenance: replacing on the every 6 months schedule
Performance restoration after noticing reduced output or efficiency
Preventive replacement before a worn part causes secondary damage
Who Should Buy This
This replacement filter is ideal for Brita Longlast+ OBL21 owners who notice a decline in their water filter's performance and want to continue enjoying clean, filtered water without purchasing a new unit.
Not ideal for: If your Brita Longlast+ OBL21 is significantly damaged or beyond repair, replacing the whole unit might be more cost-effective.
Good to Know Before Buying
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Always confirm your exact model number (OBL21-3) before ordering. Part numbers vary between model variants and production years. Check the label on your device or original documentation to be sure.
Frequently Asked Questions
What is the part number for the Brita Longlast+ OBL21 Longlast Filter?
The part number is OBL21-3. Always verify this matches your exact model (OBL21-3) before ordering, as similar models may use different parts.
How often should I replace the Longlast Filter on my Brita Longlast+ OBL21?
every 6 months
Will aftermarket Longlast Filter replacements work in my Brita Longlast+ OBL21?
Third-party parts are widely available and often cheaper than OEM. Look for listings that specifically mention compatibility with model OBL21-3 and check buyer reviews for fit confirmation before purchasing.
Prices change frequently. See the latest deal on Amazon.