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https://www.swelluk.com:443/velda-co2-tabs/ 
Velda CO2 Tabs
CO2 Tabs is ideal for putting into your pond, especially if you have high quantities of plants, which will be using the CO2 throughout the day.
Product Information
In nature CO2 is a primary nutrient for almost all vegetable organisms. This applies to for plants which grow on the land, but certainly also to water plants. Under the influence of (sun) light plants take in CO2 and covert it into sugars, which are necessary for growth.
This consequently makes CO2 to be a very important factor in the development of the pond plants.
The contents of the packing is sufficient to treat 4,000 litres of pond water with CO2.