These are single 2x10 standard size replacement filter cartridges that you can use to upgrade your existing system or to replace your Promolife Fluoride removal filters. Bone char also removes chlorine, heavy metals, pesticides and more.
Recommended number of bone char cartridges:
5 stage unit - depends on your initial setup
4 stage unit - 3 cartridges
3 stage unit - 2 cartridges
2 stage unit - 1 cartridge
The remaining cartridge can be carbon block, KDF/GAC, or another bone char.
