in conjunction with the WEPOS mildew remover Contains chlorine a very ingenious invention. We had in one of our rooms, caused by a thermal bridge, every 4 weeks mold. Zig experiments with various mold shredders brought no remedy. By chance we came across these 2 products and due to the great reviews ordered this item. Repent we have so far. In no case For more than 3 months, not a single mold more!