The single refill kit contains enough high capacity premium grade exchange cation resin and all the tools needed to refill your single tank double standard softener one time. This high grade resin meets the specifications required by major engineering companies. This product is used in the production of ultra pure water, preparation of condensate, radiation water treatment, and in the manufacturing and purification of pharmaceutical products. The kit includes the resin, funnel, silicone lubricant, distributor cap, and instructions, making the refill a quick and very simple 10-minute job. THIS IS NOT DEIONIZER RESIN.