4 kg container. Photo for reference only. This product, when dissolved in water, is used to clean membrane filtration systems, also known as concentrators, separators, or RO reverse osmosis systems, equipped with reverse osmosis or nanofiltration membranes. Suitable for MemProtec, Filmtec, or Hydranautics. It helps dissolve and remove most mineral salts encrusted on the membrane surface. Follow the recommended solution-to-permeate ratios indicated on the packaging and let soak for 24 hours. Keep out of reach of children and avoid contact with skin or eyes.