JBL Kugeln 7+ 13 Balls

Revitalises depleted substrate, easy to apply in established aquariums.
Specially produced clay balls loaded with nutrients that gives the ground new storage capacity for nutrients.
Long-term supply of root fertiliser for aquatic plants.
Contains iron and minerals in a form readily accessible to plants through the roots.
Free of algae-encouraging nitrate and phosphate. Depending on the size of the plants, press one or more balls into the root zone once a year.