Chlorine Filter - Hose Attachment. Chlorine is very toxic to fish and wildlife in your pond. This easy to use filter attaches to your water supply line and comes complete with brass garden hose fittings. The filter has granular activated carbon and multistage filtration that reduces the chlorine as you top off water from evaporation. In addition to reducing the chlorine this device will also remove other suspended particles in the supply water. Size: 12” x 2.5” with brass garden hose fittings.