Harvey Water Softener™ resin is made from petrochemical products.
Resin is synthentic plastic made from polysterine sulfonate, shaped into beads that look like brown sugar. Each macroporous sulphonated polystyrene bead has a 1% DV cross linking that works to soften resins. The technology is unsurpassed to date.
Resins last a long time - the water softener is more likely to wear out before the resin. A Harvey Water Softener™ will not need a new resin during its normal lifetime.