Excellent 17,000+ Reviews
OP-GF1 Replacement Filter Cartridges
A filter with no spare is a countdown. When the cartridge is done, so is your clean water.
Genuine replacement cartridges for the Outlast Family Gravity Filter (OP-GF1). Same hollow-fiber core, same fit. Keep two in the kit so a used-up filter never becomes the emergency.
- Fits the OP-GF1 only, no adapters
- Up to 1,400 gallons per cartridge
- Backflushable, no tools
- Sealed, no expiration in storage
- Two spares covers a family for a year
$34.96
$50.00
SAVE 30%
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"Ordered the 5 pack the same day as the filter. Cheap insurance."
Mike R.
Questions?
Frequently Asked Questions
Will these fit other gravity filters?
No. They are built for the Outlast OP-GF1 housing and thread.
How do I know when to replace one?
Flow slows noticeably and does not recover after a backflush. Most families see well over 1,000 gallons first.
How should I store spares?
Dry, in the sealed pack, anywhere above freezing. A cartridge that has never been wet has no shelf life.
Never Let the Filter Be the Weak Link
- Genuine OP-GF1 fit
- 1,400 gallons each
- Sealed for storage
- Ships free
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