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Choosing

Oil or oil-free freeze dryer pump: the five year cost compared

An oil pump is cheaper to buy and needs oil changes. An oil-free pump costs several hundred more and asks nothing of you. Over five years the totals are closer than either sales pitch suggests.

Choosing

Stackable vs shelf dehydrators: which airflow wins?

Shelf machines with a rear fan dry more evenly and need no tray rotation. Stackables cost less, store smaller and expand. The decision usually comes down to how often you dry.