Sodium Hydroxide (Caustic Soda) Solution – NSF 60 Certified 25% & 50% Liquid for pH Control, Metal Removal & Industrial Use 30–304 Kg Packaging Options Qty:50% Solution 171 kg Small Drum Enviro C® tablets are well suited for Experience the perfect blend Enviro C® tablets are well suited for hydrant flushing and in line flushing of municipal water systems where chlorine neutralization is required prior to discharge making it suitable for heavy duty industrial and warehouse use Available in 25% and 50% liquid solutions Two Concentrations Available – Choose between 25% or 50% sodium hydroxide solutions depending on your process needs