For the majority of our customers, the Natural Hot Tub Company Water Treatment and Conditioner and an oxidizer are the For the majority of our customers, the Natural Hot Tub Company Water Treatment and Conditioner and an oxidizer are the primary products needed. There are two oxidizers that are effective: 99% sodium dichlor chlorine granules or a non-chlorine shock oxidizer such as Leisure Time Renew. There are occasions that additional products may be needed such as a calcium increaser, a stain and scale preventor, and/or a clarifier. We highly recommend using a Carbon Block/Redox Pre-filter. The Pre-filter will remove heavy metals and unwanted minerals that are often found in well water as well as municipal water.primary products needed. There are two oxidizers that are effective: 99% sodium dichlor chlorine granules or a non-chlorine shock oxidizer such as Leisure Time Renew. There are occasions that additional products may be needed such as a calcium increaser, a stain and scale preventor, and/or a clarifier. We highly recommend using a Carbon Block/Redox Pre-filter. The Pre-filter will remove heavy metals and unwanted minerals that are often found in well water as well as municipal water.