They come with blue caps or Black as the Manufacturer uses both Lead???>99% Fluoride??? >85% VOC???Volatile Organic Compounds???>98% Metals???Aluminum, Iron, Mercury, Nickel & Zinc???>98% MTBE???>97% Arsenic???>95& Glyphosate???>99.9% Pharmaceutical Compounds???Acetaminophen, Progesterone, Ibuprofen, Naproxen Sodium???>95% Herbicides???>99% Nitrates???>92% Pathogenic bacteria???>99.9999% (ALcontrol Laboratories) Cholera, Typhoid, Salmonella, E. Coli, Fecal Coliform Cysts???100% (ALcontrol Laboratories) Cryptosporidium Parvum, Giardia Lamblia Sediment???100% absolute to 0.5microns (IBR Laboratories) Chloramines???>99% Chlorine???>99% Filtering Capacity 900 gallons