Microbe-Lift® Bio-Black Enzymes & Pond Colorant Color Changing which means that they are

which means that they are electronically controllable

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or on the patio

these airstones are Ozone resistant and applicable in acidic (low pH) or alkaline (high pH) waters

Extended snout allows more efficient skimming while easing installation and concealment

Microbe-Lift® Bio-Black Enzymes & Pond Colorant Color Changing which means that they areMicrobe Lift Bio Black Enzymes & Pond Colorant is specially formulated to safely color reflecting ponds black while its enzymes assist the beneficial bacteria in your pond to create a healthy pond environment. Will not stain birds, fish, pond rocks or most concrete fountains once diluted Safe for humans, plants, fish and other aquatic life Mixes completely in just hours Application Each ounce treats 500 gallons. SKU UPC Code Description BIOBLK8