What is the purity (%) of your kieserite Granular？-kieserite

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What is the specification of your kieserite？
Rongqing Chemical kieserite ‘s basic specification for granular Fertilizer
MgO≥20%
CaO≥3%
SiO₂≥6%
The Other Iterms can be customized:
Granular color & size /Fomula/ Packaging specification

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Rongqing Chemical

Rongqing Chemical Co. Ltd, established in 1991, is a China-based kieserite Manufacturer & Exporter. Located in Yingkou Liaoning -the China magnesium We focus on kieserite,magnesium sulfate