20" Granulated Carbon Filters

Finest Filters 20” Jumbo (4.5” Wide) granulated carbon (GAC) filter cartridge. A suitable replacement for all larger diameter housings. Commonly referred to as ‘big blue’ housings.

You are purchasing a 20" Reverse Osmosis granulated carbon (GAC) filter cartridge.

Important - Please Note: These are 20" filter cartridges and not 10" which is used on standard residential RO units. If you have a small residential unit, please see our 10" filters in our eBay shop.

You are purchasing a pack of 3 x 20" Reverse Osmosis granulated carbon (GAC) filter cartridges.

Important - Please Note: These are 20" filter cartridges and not 10" which is used on standard residential RO units. If you have a small residential unit, please see our 10" filters in our eBay shop.

You are purchasing a pack of 5 x 20" Reverse Osmosis granulated carbon (GAC) filter cartridges.

Important - Please Note: These are 20" filter cartridges and not 10" which is used on standard residential RO units. If you have a small residential unit, please see our 10" filters in our eBay shop.

You are purchasing a pack of 10 x 20" Reverse Osmosis granulated carbon (GAC) filter cartridges.

Important - Please Note: These are 20" filter cartridges and not 10" which is used on standard residential RO units. If you have a small residential unit, please see our 10" filters in our eBay shop.