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This Velda pond balance bacteria contains nitrifying bacterial colonies in liquid form. It can be used to quickly create a biological balance in your pond. A 25 ml package (= 1 measuring cup) contains approximately 2.5 billion Bacillus spp. in spore form. These liquid water purification bacteria immediately start breaking down organic waste and biologically cleaning your pond! They help purify the water, promote healthy plant growth and ultimately create a biological balance in your pond.4