When setting up a new aquarium, mix with the substrate and cover with a top layer of washed gravel/sand, contains all the essential plant nutrients such as iron and clay. Acts as a nutrient depot, absorbing surplus nutrients or releasing them as required. Effective for minimum 3 years, does not contain the algae nutrients phosphate and nitrate.
Dimensions: 3″ x 4″ x 3″
Weight: 400 g