Manganese sol'n; 1,000 ppm. Increases manganese in recirculating seawater systems. Increases primary productivity. Required by photoautotrophs (including zooxanthellae) for photosynthesis, pigment production, reduction of nitrite and nitrate, antioxidant activity. 1 drop (0.05 mL) per 48.1 gal. (182.0 L), or 1 mL per 961.8 gal. (3,640.3 L), once daily to maintain NSW value for S=35. 1,000 ppm manganese, derived from manganese chloride (hydrated source, USP).