ReeFlowers Natural AquaSand is natural and water-insoluble so does not cause any change in gH kH and pH values. It can be used in every kind of soft water aquarium including Discus aquariums.It helps to create the optimum environment for nitrifying and denitrifying bacteria helping to clean water.It is not chemically treated and has no synthetic content. Does not contain heavy metal or toxic substances and doesnt cause any algae. Especially produced for aquarium use. Sand particles are not angular sharp or keen therefore does not cause any harm to aquarium inh1abitants.Water insoluble Does not effect pH value For a faster clarification of water its recommended to be rinsed before use and that ReeFlowers AquaClear is added after its introduction into the aquarium.10 kg of ReeFlowers Pearl White Sand forms an area approximately 3cm high sand on a 50x50 base.