General Hydroponics FloraKleen Removes fertilizer residue that can accumulate over time in hydroponic systems, growing media and potting soils. Monthly use purges your hydroponic system or potted plants of excess salts that can accumulate as a result of regular fertilizer application. Use any time throughout the plants life. FloraKleen is an excellent final flush, improves flavor. Its high concentration and low price make it the economical choice for maintaining your plants.