KOI PHARMA introduces Koi Defender, the ultimate solution for protecting your koi from harm.Koi Pharma Koi Defender is a premium blend of beneficial bacteria and natural enzymes designed to support a clean, balanced pond environment for koi and goldfish. Koi Defender helps create a pond environment that naturally discourage imbalances and conditions often associated with harmful bacteria. This high-potency formula is ideal for regular pond maintenance and proactive wellness support, helping koi enthusiasts maintain vibrant, healthy fish without disrupting biofilters or beneficial microbes.