The WM aquatec Silvertex fleece's Silvertex system provides effective protection for your fresh water system from biofilm formation and for your drinking water from contamination every time the tank is refilled thanks to the automatic dosing of silver ions. The silver ions contained in the WM aquatec Silvertex fleece damage the cell membrane, deactivate cell enzymes and prevent new DNA formation. Available for 40-litre or 120-litre tanks. Use biocides safely! Always read the label and product information before use.