The extractables in the filter medium can create a problem in the subsequent use of the permeate. This remains a problem in some filter media where additives are used for improved performance. The origin of extractables is either in the processing or the housing device of the filter. Various kinds of extract-ables are found, including metals, oligomers, loose polymers, plasticizers, wetting agents, antioxidants, resins, fillers and mould-release chemicals. The usual practice is to wash off the filter material immediately before use. The type and amount of impurity in filter media is not consistent. Each type of impurity has its own rate of extraction from the medium. Hence there is no universal filter-treatment procedure which can ensure a contamination-free permeate. The washing procedure could be under- or overdone in certain applications. The challenge exists to manufacture consistent contamination-free filter media.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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