"The Waterline Cleaner is a special cleaning agent that is designed to remove the dirty edge that leaves the swimming pool water on the swimming pool liner or tile wall. This edge can be caused by remains of sunscreen, lime and other organic dirt, creating a dark discoloration. With the waterline cleaner you can also use this clean edge. The swimming pool is filled and in use. Product Specifications: - Special cleaning agent for removing dirty edges in the swimming pool - Removes residues of Les coups de soleil, la chaux et d'autres saletés organiques - empêchent les décolorations sombres sur la doublure de piscine ou le mur de tuiles - en toute sécurité à utiliser et à utiliser - un gel pratique qui adhère facilement à la piscine verticale - facile à utiliser pour une piscine propre et fraîche