How does China's potassium sulfate capacity shape potassium pyrosulfate supply?

How does China's potassium sulfate capacity shape potassium pyrosulfate supply?
Potassium pyrosulfate sits downstream of potassium sulfate, so China's potash landscape matters. Domestic potassium sulfate capacity is relatively fragmented compared with potassium chloride, with the top two producers holding roughly 43 percent combined. The largest single producer commands about a third of the market. Crucially, potassium sulfate output is seasonal: plants typically schedule maintenance from May to September, which historically drags operating rates lower in that window. For pyrosulfate makers, that means feedstock availability and pricing can tighten mid-year. The alternative route via potassium bisulfate decomposition offers some flexibility, but both paths ultimately depend on potassium sulfate or related potassium salts. Buyers sourcing pyrosulfate should therefore watch potassium sulfate plant turnarounds and the broader potash import price environment, since imported potassium chloride feeds much of the processed potassium sulfate chain.