This Velda pond balance bacterial contains nutrifying bacterial cultures in liquid form, and can be used to quickly create a biological balance in your pond. A pack of 25 ml (= 1 measuring cup) contains approximately 2.5 billion Bacillus spp. in spore form. These liquid water-purification bacteria start immediately to break down organic waste and clean up your pond biologically! They help to cleanse the water, promote healthy growth of plants and ultimately create a biological balance in your pond.