Using Water in Formulations and Fine Filters

Regarding your questions:

1. Using bottled drinking water from a convenience store: For cosmetic formulations, it is generally recommended to use purified water, distilled water, or deionized water instead of standard bottled drinking water from a convenience store. While convenience store water is safe for drinking, it may contain minerals and impurities that could potentially affect the stability, clarity, or efficacy of a cosmetic product over time, especially in sensitive formulations. Using high-purity water ensures consistency and reduces the risk of unwanted reactions or microbial growth.

2. Fine filter mentioned in mixing instructions: A fine filter in formulation refers to a filter used to remove small particles, impurities, or precipitates from a liquid mixture. This step is often done to ensure the final product is clear, smooth, and free from any solid contaminants. Common types include syringe filters or filters used with a vacuum filtration setup, with pore sizes typically ranging from 0.1 to a few microns depending on the required level of filtration. Based on the product search, I could not find a specific product or standard search term for this type of filter in the store's catalog. You might look for terms like "filter paper," "syringe filter," or "filtration membrane" if searching elsewhere, but it's best to check the specific instructions or context where the "fine filter" was mentioned to understand the required pore size and type.

It is always best practice in cosmetic formulation to use ingredients and equipment specifically designed for cosmetic or laboratory use to ensure safety, quality, and stability of the final product.