Sequion products have strong sequestering and dispersing properties, suitable for any discontinuous and above all continuous preparation processes where it is necessary to stop the reactivity of some metals and prevent the build-up of deposits / incrustations that may easily form since the recipes in use are generally quite concentrated. They can consist of simple or modified phosphonates and even of blends including several phosphonates, acrylates and poly-hydroxycarboxylates so as to obtain compounds for multiple actions on various metals and on impurities released by the textiles.