CFS Reverse Osmosis & Reef Aquarium Water Filter Replacement – Pick Your Stage (RO/DI)

Hey reef keeper or RO water pro!

This is a brand new CFS filter—still sealed up and ready to go.

Whether you’re topping off a saltwater tank or just need clean drinking water, you can pick exactly what stage you need.

It plays nice with a ton of popular systems like Koolermax KPAK-3, Water General FK-3, APEC Stage filters, and even Bulk Reef Supply’s Value series.

Also fits AR122 and HK120 models.

Basically, if you’ve got a standard RO/DI setup, this is likely your match.

The packaging might be a simple box or bag—manufacturer style—but the filter inside is fresh.

No MPN listed, but the UPC is 0045399056085, so you can double-check compatibility.