Magnesium Sulphate Heptahydrate in Free Flowing Crystal Form is ideal for maintaining the magnesium concentration in marine aquaria, which consists of large amount of stony corals as it is slowly depleted in their calcification process. Magnesium Sulphate Heptahydrate is available in white coloured free flowing crystal form. Magnesium Sulphate Heptahydrate is formulated using an accurate composition of various ingredients. Magnesium Sulphate Heptahydrate in Free Flowing Crystal Form maintains precise pH value and comes in different specifications to suit specific requirement.