Microbe-Lift Bio Black 16 oz

Specially Formulated to Safely Color Reflecting Ponds Black!  A product that safely colors water while its enzymes assist the beneficial bacteria in your pond to create a healthy pond environment. This product will not stain birds, fish, pond rocks or most concrete fountains once diluted, but be forewarned, that if you pour this stuff on your patio full strength, I think you will have a stain.  It is considered non-hazardous and safe for humans, plants and aquatic life.  It mixes completely in hours and is available in two sizes; 8oz and 16 oz.