The best filter available to remove both chlorine and ammonia, is reverse osmosis. When choosing a reverse osmosis system for Sydney you should choose one that is watermark approved, NSF 58 certified and low waste. Do not buy on price or the amount of stages, a reputable dealer should be able to explain why you are paying either a lot more than the going rate or alternatively a lot less. Also country of origin should be transparent, our housings and systems are USA made.