ESV Granular Activated Carbon based on bituminous coal provides the best combination of pore size, large particle size, high surface area, low ash, and hardness for chemically filtering aquarium water.
In addition, test results indicate no leaching of phosphates. The high hardness level of this carbon prevents the dispersion of particles throughout the aquarium which can occur with softer grades of carbon.
The large particle size facilitates water movement through the carbon and helps prevent the removal of planktonic food organisms via mechanical filtration.
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Good product Review by Mark D
Rises well of dust in cold water with strainer. Particles of similar size. Have used this brand for three years with no complaints. (Posted on 9/17/2014)
good product Review by Anthony
rinses well and keeps aquarium sparkling (Posted on 9/8/2014)
great product Review by Anthony
I always use this product in my g.f.o. reactors rinses quick and keeps water crystal clear. its always in stock at a great price. (Posted on 7/28/2014)