The Oase Dechlorinator is an excellent device that uses high-performance active carbon to remove any harmful additives from tap water, making it safe for your fish and plants. It's easy to install and can be connected to a standard garden hose pipe via high-quality metal quick-release couplings. You can link it to your outside tap and leave it until the pond is full. The Dechlorinator is compact, measuring around 50cm long, and can filter up to 200,000 litres of tap water before replacement. For efficient removal of chlorine, chloramine, and heavy metals, it's advisable to maintain a maximum recommended flow rate of 500 litres per hour or around 8 litres per minute.