CalMedia - GSR Plus

CalMedia GSR Plus consists of a light weight granular core with a coating of manganese dioxide. The coating provides an example of contact filtration where the media itself provides the oxidizing potential. This allows for a much broader range of operation than many other iron removal medias. Water with a pH level as low as 6.2 can be treated. Dissolved oxygen is not essential. The media`s light weight reduces backwash water requirements.

When the oxidizing power of CalMedia GSR Plus is reduced, the bed has to be regenerated with a weak solution of potassium permanganate (KMn04), thus restoring its oxidizing capacity. A regenerating solution of IV2 to 2 ounces (dry weight) of potassium permanganate per cubic foot is sufficient for normal regeneration. Upon start-up, a new bed should be backwashed and caution taken to insure that the lightweight media is not backwashed to drain. A new bed should be regenerated the evening of installation. Operating the filter after its oxidizing capacity is exhausted will reduce its service life and may cause staining.

CalMedia GSR Plus requires either intermittent or continuous regeneration to maintain its oxidizing capacity. For continuous regeneration, a solution of potassium permanganate (or chlorine then potassium permanganate) can be pre-fed to maintain capacity. The manganese dioxide coating acts as a contact oxidizer to enhance the oxidation reaction and as a buffer to reduce any excess potassium permanganate concentration and prevent it from entering the service lines.

The addition of other chemicals to influent or backwash water which contacts CalMedia GSR Plus may inhibit iron, manganese, or hydrogen sulfide removal, or may break down or coat CalMedia GSR Plus. Before adding any chemical to the influent or backwash water (other than chlorine or potassium permanganate) the chemical`s compatibility with CalMedia GSR Plus should be thoroughly tested.

• Broad operating range for iron reduction
• Lower pressure loss through the bed with high flock holding capacity
• Effective hydrogen sulfide, iron, and manganese reduction
• Light weight requires lower backwash rates and reduces pumping requirements
• Chlorine can be beneficial in extending filter run times
• Low attrition loss for long bed life
• Lower shipping cost