Hi Friend,
Nice to meet you, this is Amber from XYF, we are manufacturer of Magnesium Sulfate series fertilizer since 1993. Many of them are water -soluble fertilizer, as below:
Magnesium Sulphate Heptahydrate: 0.1-1mm; 1-3mm; 2-4mm.
Magnesium Sulphate Monohydrate-Industry Grade: Powder and Granule.
Magnesium Sulphate Monohydrate- Agriculture Grade--Kieserite: Powder and Granule
Magnesium Sulphate Anhydrous: 98% Powder.
Magnesium Oxide: MgO 70% 75% 80% 85% 88% 90%
Zinc Sulphate: Monohydrate and Heptahydrate
MKP
MgCL2.6H2O
Magnesium Nitrate Hexahydrate: Mg(NO3)2.6H2O

Should you have any further requirements, please do not hesitate to contact me. I would be delighted to offer you our best price.
Best regards
Amber Li
Tianjin Xingyu Fertilizer Industry Co.,Ltd.
Whatsapp/Wechat: 008613042210466