FREE Senno Dual Inline TDS meter (orders > $100, enter code: “FREEDUALTDS” in your cart) & FREE SHIPPING (orders > $130 , enter code: “FREESHIP” in your cart)...Don’t forget to credit Reef Frontiers by using your club’s unique 10% off code: (enter code: “96297” in your cart). Enter your discount code(s), click the orange “apply coupon” button in the discount codes section of your shopping cart at www.AirWaterIce.com. After over 30 years in business, we still have your filter pack. Remember you can pay MORE but you can't get LESS than ZERO tds. As always: Happy Reefing, Your friends at www.AirWaterIce.com ( email: sales@airwaterice.com to get a FAST answer )