Yesterday we discussed a few testing and removal options for nitrates. Today we’d like to address an issue brought to our attention by several readers: nitrate filters for existing filter housings.
A good number of water filter companies have started using one of several common sizes (20″x2.5″, 10″x2.5″, 20″x4.5″, 10″x4.5″) for their housings in an effort to standardize product lines between manufacturers and give consumers more filtering options once they own a particular type of filter system.
Many people refer to those sizes as ‘big blue’ sizes since at one time, and still to this day, a very popular brand of water filter (Pentek) manufactured its products using blue polypropylene.
Now that you know a bit more about filter housing sizes, and hopefully have figured out the correct size cartridge for the unit you own, below you will find several replacement nitrate filter cartridge options:
