Limestone is an essential raw material

Nordkalk Filtra A

Nordkalk Filtra A products are high quality crushed limestone products developed for drinking water alkalisation. Limestone alkalisation method is ecological and safe way to increase water pH and hardness. Limestone is also inexpensive as an alkalisation material.

Nordkalk Filtra A limestone alkalisation is a solution especially for soft waters. Limestone alkalisation method is widely used in Northern European countries.

Filtra A limestone alkalisation is used at water utilities, which use ground water as raw water source. The water is run through a bed of crushed limestone, which elevates the pH, alkalinity and hardness of the water.

Nordkalk Filtra A -products
Nordkalk Filtra A1 1-3 mm
Nordkalk Filtra A2 2-5 mm
Nordkalk Filtra A5 5-8 mm

Leader in Northern Europe

Nordkalk is the leading limestone company in Northern Europe. We deliver essential raw materials to numerous industries, and our solutions contribute to clean air and water as well as productivity of agricultural land.