EA Dechlorinator Carbon In Line Filter 12" treats 225,000 Litres with a max flow rate of 4 lpm. EA Dechlorinator Carbon In Line Filter 30" treats 550,000 Litres with a max flow rate of 4 lpm. As all fishkeepers know, it is necessary to remove chlorine and other impurities from tap water when introducing it to a pond or aquarium.
eBay