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https://www.swelluk.com:443/velda-bacterial/ 
Velda Bacterial
An extremely powerful filter bacteria designed to kick start a new filter or an existing filter after treatments have been added.
Product Information
An extremely powerful filter bacteria designed to kick start a new filter or an existing filter after treatments. Bacterial contains nitrifying bacteria cultures in lyophilized form. If a pack of Bacterial of 50 ml will be added to pond water, within 24 hours ca.
Containing 20 thousand million nitrifying bacteria will be produced. Although tiny and invisible for the human eye, these bacteria are indispensable for nearly any form of life on earth. This also applies for your garden pond. These liquid water-purification bacteria immediately start cleaning your pond biologically! They help to create a biological balance, clear the water and promote healthy plant growth.
Dosage:
25 ml per 2500 litres of pond water. Composition: contains 2.5 billion Bacillus spp. per 25 ml in spore form. Storage: do not store in direct sunlight and keep tightly closed at room temperature. Repeat 4 times a year