http://www.rosebudmag.com/growers/hydroponic-supplies/double-timing-growzays-is-two-hydroponic-systems-in-one
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Growzay’s, a simple hydroponic system that can also function as aquaponic system, is perfect for hydroponic growers. Check out more details about Growzay's system here.
http://www.rosebudmag.com/growers/hydroponic-supplies/double-timing-growzays-is-two-hydroponic-systems-in-one