Quartz sand and gravel for multilayer filters.
Natural (not brittle) quartz sand and gravel ideal for multilayer filters of sand, carbon, ironing and others. Consisting of rounded and not angular grains that make it perfectly suitable for water refining. The granulometric grading is done with the standard EN12904 in order to meet the specifications for drinking water treatment. Its SiO₂ content exceeds 95% and gives it excellent hardness and durability.
