Quality control processes are key to keeping turbidities and silica exposure low. Turbidity is the measure of suspended particles, such as clay or sand, in distilled water, and it is one of many testing methods performed for American Petroleum Institute's (API) Recommended Practice 19C and the International Organization for Standardization's (ISO) 13503-2 proppant testing standards. Current API and ISO standards require turbidity to be 250 Formazin Turbidity Units (FTUs) or less. In essence, a lower turbidity means the sand is cleaner and has less dirt and silt attached to each particle.
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