Botanicare's Hydroguard is now back, replacing its previous replacement AquaShield. Now being formulated with a different species of bacteria, Bacillus Amyloliquefaciens (as opposed to the previous and more commonly used Bacillus Subtilis), it is even more concentrated and effective at improving root health and root mass. Plus the shelf-life has increased to 2 years, instead of the 1 year shelf life of AquaShield. A great weapon against root rot.