Mainly used as a breeding medium in Libra boxes or channel floors with drip irrigation systems. Grodan rock wool has a neutral pH value and should be soaked and rinsed with pH values around 5.5 to 6.0 (never below 5!) Before starting breeding.

A rock wool mat is about 1m long, 15cm wide and 7cm high.

GT Master Slab 100x15x7.5cm