This product is considered a miracle worker to many. It solubilizes and then clears agglomerated pigment when used as directed. We pride ourselves on the amount of Epson 4900, 7900 and 9900 printers that we have saved from the recycling center. It may not fix all printers, but it fixes a whole lot of them! We invented PiezoFlush to extend the life of our printers at Cone Editions Press and began sharing it with InkjetMall customers more than a decade ago. It's strong but safe enough to be a storage fluid (which we highly recommend if you're going to leave your printer for more than a month!