Mineral cartridge systems are sold under the following trademarked names: Nature2, Vision,and
FROG. These products kill contaminants, primarily bacteria, in the water as it passes through a
cartridge. This means the pump and filter must run for long periods of time to treat the tens of
thousands of gallons of water in a swimming pool. Pool suppliers, who sell these systems, often
recommend that you run your pump and filter 24 hours per day, 7 days per week.
While, these systems do reduce the need for chlorine or other chemical oxidizing treatment, they
do not eliminate the need for these chemicals.
These systems also require a trip to the pool store to purchase expensive cartridges. In some
cases more than one cartridge may be needed in one season. There is no obvious way to
determine when these cartridges fail to be effective. Their effectiveness may expire prior to the
cartridge contents being totally depleted.