Purple & Black Set for optimal filtraion of chlorine and chloramines taste & odour. Purple Filter: This is a triple sediment, taste and odor controlling, chlorine reduction filter, which removes dirt from your water while controlling lime and scale deposits on your valuable equipment. Better taste, better water, better for you. Black Filter: Chloramine is used as an disinfectant in municipal city waters. Chloramines in water, is a mix of chlorine and ammonia. It is dangerous when used in aquariums and ponds and dialysis machines.