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HPMC is a semi-synthetic polymer derived from cellulose. In its ophthalmic formulation, it is commonly used as a thickening and emulsifying agent. The specific formulation of HPMC ophthalmic solution typically includes a concentration range of 0.3% to 0.5% HPMC, along with other excipients to stabilize the solution and enhance its performance. The USP designation indicates that the product meets the standards set by the United States Pharmacopeia, ensuring its quality, safety, and effectiveness.

Foam in water wells typically results from the combination of bubbles caused by various organic and inorganic substances present in the groundwater. Factors such as high levels of dissolved organic matter, chemical reactions between water and minerals, and the presence of certain bacteria can exacerbate foaming. When foam forms, it can create a barrier, reducing the water flow rate and making the extraction process less efficient. Moreover, excessive foaming can lead to mechanical issues in pumps, increasing maintenance costs and downtime.