Not really as natural Zeolite can exchange its Na+ ions with Ca++ and Mg++ ions. That's why it was first used for water softening processes. In order to reduce the NO3- concentration you should a filter media that has available Anions that can be exchanged with NO3- ions. These are ION EXCHANGE RESINS that they have, mainly, Cl- ions available. Fe and Mn can not be removed by ZEOLITE.

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Not really as natural Zeolite can exchange its Na+ ions with Ca++ and Mg++ ions. That's why it was first used for water softening processes. In order to reduce the NO3- concentration you should a filter media that has available Anions that can be exchanged with NO3- ions. These are ION EXCHANGE RESINS that they have, mainly, Cl- ions available.

Fe and Mn can not be removed by ZEOLITE.