Evolution Aqua 30" Dechlorinator Carbon In Line FilterFrom the Evolution Aqua range. 30 will treat up to 550,000 litres 122,083 uk gallons. A quick & simple method of filtering out harmful chlorine & other impurities from tap water. Sometimes referred to as a water conditioner, the chlorine removing dechlorinator is ideal for use when first filling up, carrying out water changes & keeping a top up trickel feed for both ponds & aquariums. Theres no need to wait for chlorine to gas off or to use liquid