The General Hydroponics FloraKleen 4 Litres is an efficient, natural solution for cleaning hydroponic and soil systems to keep them running smoothly and healthily. It is made from a unique blend of safe, non-toxic microbes that can break down and eliminate excess salts and minerals that can accumulate in systems and cause root rot and other issues. FloraKleen helps to prevent buildup of these substances and helps to promote healthy nutrient availability and absorption in your system. It is also perfect for use when switching to another nutrient solution and is ideal for helping to reduce stress on plants. FloraKleen is easy to use and can be used in any hydroponic or soil system.