JBL Biotopol Plus quickly converts tap water into healthy aquarium water - specifically for tap water with a high chlorine content. This product is identical to JBL Biotopol, with the only difference being that it contains more chlorine binders for very high chlorine contents. Protects gills, skin and fins noticeably thanks to aloe vera plant extract. Vitamin B complex is proven to reduce stress in fish. Neutralises toxic heavy metals, e.g. copper, lead and zinc.