It's a tad expensive 0.5L = £9.77 inc vat + £3 delivery, but appears very concentrated. I was looking for an Azomite / rock dust equivalent and this sounds very interesting.
Quote from thier website:
OceanSolution is a revolution in health for crops, food and people. A concentrated liquid comprising the 90+ elements and aerobic bacteria necessary for all plants to develop strong and healthy tissue.
Used in the correct manner, far from being harmful, the salt content is truly beneficial and perfect for use on farms, orchards, recreational areas, forestry, hydroponic units and gardens. In essence, OceanSolution will boost any plant with a green leaf!
OceanSolution contains the 90+ naturally occurring elements, plus a range of positive aerobic bacteria. These are all considered to greatly enhance the health of both the plants, and the soils in which they grow.