Flora Viv K is a high quality, concentrated, bio-available, potassium supplement for freshwater planted aquariums. It is designed to provide critical supplemental potassium for biological processes in all plants, such as photosynthesis, nutrient uptake, and strong root growth. Potassium deficiency in plants often causes chlorosis, and is seen as pale leaves even tissue decay. Other deficiencies can cause similar symptoms, such as deficiencies in nitrogen, iron and magnesium. It is therefore recommended that the hobbyist use Flora Viv first, to provide a wide range of plant nutrients, and then use then use Flora Viv K, this product, to supplement potassium, if necessary. Flora Viv products contain no toxic polycycloglutaracetal or glutaraldehyde. Do not overdose this product! Simultaneous use of Bacter Gen F to establish and sustain growth of proper microorganisms and recycle aquarium nutrients will greatly benefit all plants. The use of Flora Viv Prolifera will provide additional carbon for heavily planted aquariums. Growth of all photosynthetic organisms also requires strong lighting of proper spectrum. Consult your lighting supplier for assistance in the proper type of light, and photo periods for the plants that you are growing. Be sure to ask lots of questions to get the very best lighting system for your aquarium.