Purity Maypro's Chitosan undergoes the most rigid quality control procedures. Maypro's valued suppliers uses only the freshest crab&shrimp shells. In fact we insist that processing occurs within 48 hours of harvesting! This ensures that unwanted protein and calcium is thoroughly removed. Compare and discover! Maypro's Chitosan is brighter and more uniform in color than competitor products. The key is prompt cultivation and strict quality standards. Other chitosan may be high in ash content and bacteria. Examine your material closely--sandy particles are due to poor processing. Be sure to check if the chitosan you are using is appropriate for food use. Many vendors have tried to substitute inexpensive, industrial grade product which is not suitable for finished goods.. Polymerization Drag your finger across a bagged sample of chitosan. Does the material follow your finger? It should if it is a high quality product. We have tested many products which none have matched the effectiveness of our material. Deacetylation A guideline for activity. Chitosan comes in a variety of grades. We guarantee a minimum of 80%. For those looking for the purest product, we have 90% & 95% product the highest quality on the market!