Specifically formulated for cultivation in Rockwool slabs. A twin-pack liquid nutrient solution based originally on Rockwool guidelines from Holland and elsewhere and refined by fifteen years practical experience in commercial hydroponics. This solution is highly recommended for all hydroponic systems using RockWool slabs. EUROPONIC Grow for the vegetative stage of growth. EUROPONIC Bloom for the flowering stage of growth. Ionic boost can be used with all twin pack nutrients such as europonics and other nutrients of good quality.