General Hydroponics FloraKleen removes fertilizer residues that can accumulate over time in hydroponic systems, growing media, and potting soils. Use FloraKleen monthly to purge your hydroponic system or potted plants of excess salts that can accumulate as a result of regular fertilizer application. FloraKleen is an excellent final flush, and can be used at any time to dissolve mineral and salt buildup. Its high concentration and low price make FloraKleen the economical choice for maintaining your plants in both hydroponic and soil-based environments. . Dissolves accumulated fertilizer salts. . Reduces plant stress from excess and imbalanced nutrients. . Releases nutrient bonds between plants and systems, also correcting nutrient lock-out. . Use FloraKleen as a final flush a few days before harvest to promote maturation and sugaring. . Safe for use in all systems and media while plants are growing.