Custom Premix Selecting "Custom Premix" option means that all of the beads you have chosen will be premixed in manufacturing before the kit is sent to you.
The major water purification technologies are described below. Each technology has its benefits and limitations. Some are able to remove a large fraction of several contaminants, while others excel at removing one specific type of impurity down to very low levels. As a result, in order to remove all contaminants to the levels required for critical applications, it is necessary to use a combination of technologies.