- extremly coarse coral sand 0,5kg
- Calciumcarbonate as hardness buffering filter medium
- For pond- and aquarium filter
Coarse coral sandis well suited as a hardness buffering filter medium and is used both in pond and aquarium filters, as well as in lime reactors as a filling material.
The large internal surface with capillary action in coral sand makes that this filter medium is considered one of the best and most efficient biofilter materials for medium-sized and large pond filter systems. The growing buffer effect provides additionally the stability of the water equivalent.