A company manufactured High Purity Calcium Hydroxide that had low yields. The annual capacity of the plant was relatively low at less than 10 tons per year. I installed measuring devices to measure rinse water flows and had samples analyzed for product. This had accounted for a portion of the product loss. Steps were taken to reduce this loss. In addition, there were losses associated with the rotary filter and material handling that were identified and corrected. Because of the low annual production and the high density of the small spills of material on the process floor had a significant impact in yields. Steps were made to prevent this material from spilling or reworking the spilled material. After the measures were taken the yields were back up to design specifications.