Epsom salt is a flocculant. It thickens glazes and prevents them from settling to fast. SOGO glazes needs to be flocculated often with a saturated solution of Epsom salts. 
Add 250 gram of Epsom salts to 175 gram of hot water. Some crystals will remain on the bottom of the pot. Use only the liquid, not the crystals. 
 
250 gram