Shirakura Mineral stone is pure form of  montmorillonite  .Stone releases sustained amout of minerals in water with out affecting the water parameters, supplying bacteria and microfauna with a constant stream of needed minerals.These stones are excellent absorbers of  toxins and polutants via ion exchange, thus improving water quality directly and indirectly. Shrimps love to graze on these stones. From time to time it's advised to give the stones a little clean with an old toothbrush to remove algae.

SHIRAKURA - Mineral Stone