website reference.:
https://www.compo.com/international/products/Universal-Potting-Soil.html

COMPO SANA® Universal Potting Soil
UNIQUE COMPOSITION FOR AN OPTIMAL PLANT GROWTH
the start fertilizer works immediately and provides an optimal nutrient supply for up to 6 weeks
PERLITE breathing flakes and the root activator AGROSIL® provide a loose, airy structure and enable an optimal water uptake