Maple CDE Practice Test 2026 - Free Practice Questions and Study Guide

The key idea is using a filtration aid to speed up and improve the clarity of pressure filtration in maple syrup. Diatomaceous earth is a naturally occurring silica-based material that forms a porous, lightweight bed when added to the filter. As syrup is forced through this bed, fine particles like sugar sand get trapped in the cake, while the syrup passes through more quickly and cleanly. Because it’s made from fossilized diatoms, it provides a large surface area and effective filtration without contaminating the syrup when using food-grade material.

Other options don’t fit this role. Density is a property of the syrup, not a filtration aid. A defoamer helps control foam in the boiling or evaporating stages, not filtration. A draw-off partition is a piece of equipment related to directing syrup flow, not a filtration aid. Therefore, diatomaceous earth best explains the improvement seen in pressure filtration.