Magnesium sol'n; 100,000 ppm. Increases magnesium in recirculating seawater systems. 1 mL Isol8 Mg per 26.4 gallons (100 L) increases magnesium by 1.00 ppm. 5 mL Isol8 Mg per 20.0 gallons (75.7 L) increases magnesium by 6.60 ppm. 100,000 ppm magnesium, derived from magnesium chloride (anhydrous source, USP).