It's no secret commodities are in a free fall.
"The commodity sector is on its way down from the bursting of the largest commodity bubble in the history of the world," Walter Zimmermann said Thursday on CNBC's "Futures Now."
But this doesn't come as a surprise to Zimmermann, who explained that a "major fire sale in commodity prices" happens every 15 years. "The next low is not due until the second half of 2016," he said.
Zimmermann noted that this cycle comes in many phases, beginning with a "stealth" phase, peaking with "manic" buying and ending with panic selling, which is what he says the market has experienced for the better part of the past year. "The more damaging the bust, the longer it takes for the commodity sector to carve out a bottom and start trending higher again," he said.