ASN 4700 Series Two tank system for high hardness (> 75gpg) water. First tank acts as workhorse significantly reducing hardness while second tank acts as polisher. Prevents hardness leakage common in single tank systems. The second tank acts as a ‘polisher’ and reduces slippage as the overpowering high hardness condition has been significantly reduced. This also increases the contact time with the softener resin therefore more consistent. Salt efficiency is even more important on high hardness situations. The HEDP Series Softener offers salt-efficient upflow regeneration for ultimate salt savings.