As an Amazon Associate I earn from qualifying purchases.Updated: March 27, 2026
The Brita Longlast+ OBL21 uses a Longlast Filter to reduce contaminants in your drinking water. Over time, the filter's effectiveness decreases, impacting taste and flow rate. Replacing the filter every 6 months ensures continued optimal performance and access to clean water.
$29.78$34.99Save $5.21 (15%)
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Function: The Longlast Filter reduces chlorine taste & odor, sediment, and other impurities from tap water.
Signs it needs replacing: Reduced water flow, noticeable chlorine taste or odor in filtered water.
OEM vs aftermarket: Brita's OEM filters (OBL21-3) guarantee compatibility but are pricier. Aftermarket options are often cheaper but double-check compatibility reviews before buying.
Installation: Typically involves twisting the old filter out and inserting the new one. Refer to your device 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 on the every 6 months replacement cycle
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 for Brita Longlast+ OBL21 owners experiencing reduced water flow or taste, wanting to extend their device's lifespan.
Not ideal for: If your Brita Longlast+ OBL21 is significantly damaged or outdated, a full replacement might be more cost-effective.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.