I sift the meringe powder with the powder sugar, but sumetimes the meringe powder turns in something like wax very small pieces after mixing with the water. I do not know why nor the reason. And that block the tips. I sift the royalicing but it takes time. I am agree with the powder sugar, I only buy HEB or a local store brand (La Casa del Repostero) that have the same 10X quality,both has some cornflour to keep it powdered, other brands are grany, gray or flavor is like perfume.