The NSF certified media in the EOS Filter is highly effective at inhibiting scale formation. By changing the surface charge distribution on the scaling mineral ions, it reduces the attraction thus preventing the scaling effect. It doesn't remove the calcium or magnesium - rather it makes it almost impossible for them to attract and bind together.

The formation of scale on a surface is caused by crystallisation of carbonate or sulphate ions, chiefly calcium or magnesium. Scale forms because oppositely charged surfaces of the scaling mineral ions are attracted to one another and "stick" or adhere together.

 The EOS Filter can also help remove existing hard water deposits. As the surface charge is shifted ion by ion on existing scale, the bonds formed through attraction are broken; the scale loosens and washes away.