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 | Natural Strontium. Ref: 1073 Strontium is important for accelerating coral amd calcareous algae growth.Natural Sea Water contains approx. 7-9mg/L of strontium. This strontium is associated ("chelated") with sulphate.Since the growth of corals and cacareous algea goes hand in hand with strontium and calcium depletion, depletion of calcium (whicj is very easily measured) usually means depletion of strontium as well. Click here for more infp. £12.99
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