Fauna Marin MB20 is a professional-grade, high-capacity mixed bed resin designed for the production of high-purity water (0 TDS) for marine and freshwater aquariums. Composed of a balanced mixture of a strong acid cation and a strong base anion resin, MB20 is engineered to remove the final traces of dissolved solids that standard RO membranes may leave behind. It is particularly effective at targeting difficult-to-remove contaminants like silicates, nitrates, and phosphates, ensuring the purest possible foundation for your reef’s salt mix and top-off water.
MB20 is the ultimate polishing stage for any RO/DI system, providing the safety and consistency required for sensitive reef inhabitants.
Guaranteed 0 TDS: Effectively removes remaining ions from RO water, delivering water with a conductivity of <0.1 µS/cm for a truly "blank canvas" starting point.
Silicate Removal Specialist: Specifically formulated to bind silicates (SiO2), which are often the first contaminants to "break through" exhausted resins and cause diatom outbreaks.
High Exchange Capacity: The premium grade of the resin beads ensures a longer lifespan and more gallons of purified water produced per liter of media compared to standard resins.
Instant Action: Requires no "breaking in" period; the resin begins working the moment water passes through the cartridge, providing immediate results.
Pressure Stable: The robust structure of the resin beads prevents them from compacting or breaking down under the pressure of high-output RO systems.
How do I use Fauna Marin MB20?
The resin should be placed in a standard refillable DI cartridge or a dedicated resin reactor as the final stage of your Reverse Osmosis (RO) system.
How do I know when to replace the resin?
Monitor the output of your DI stage with a TDS meter. As soon as the meter reads above 0 or 1 ppm, the resin is exhausted and should be replaced to prevent the leaching of accumulated contaminants.
Does this resin change color when exhausted?
Fauna Marin MB20 is a non-indicating resin, meaning it does not change color. It is designed for maximum purity and capacity, prioritizing performance over visual indicators. A TDS meter is the most accurate way to monitor its status.
Why should I choose MB20 over cheaper resins?
MB20 is a nuclear-grade equivalent resin. It has a higher affinity for silicates and a more precise cation/anion balance, which prevents "pH swings" in the purified water and ensures a more thorough removal of trace pollutants.
Fauna Marin Carb L: Place this in your system to remove any organic pollutants that may have bypassed the initial RO stages.
