A modular antimicrobial and antifungal treatment system for a spa or pool includes a main module. The main module comprising a transition metal mesh configured to allow fluid to enter and exit the main module. An anti-microbial and antifungal plastic material arranged in an interior portion of the main module. Individual modules in the main module includes a time release anti-bacterial, anti-fungal, or both, components, a sea salt component, and an adsorbent material. Further, a modular antimicrobial and antifungal treatment system for a spa or pool includes a support member coupled to the main module configured to hold the main module within an interior portion of a filter.