This blog includes hints on ways to improve the quality and reduce the cost of de-ionized water. Those who use DI water in their processes know that the cost of DI water can be a major contributor to the overall cost of a process. The proper design and maintenance of a DI water system is …
Next to water filtration and “softening,” de-ionization is probably the next most common water treatment. Ions in water interfere with many cleaning processes and cause water spots on drying after rinsing. The common measure of the amount of ions in water is “resistivity.” The more “resistive” water is, the less ions it contains. Water from a municipal …
Some means of reducing water hardness as we’ve described in preceding blogs is an almost universal first step in making water pure enough for most cleaning applications. But water softening only addresses the removal of only a few of many contaminants that are commonly present in our water supplies. The remaining contaminants range from ions …
Pressure regulating valves were discussed in the preceding blog Valves – Pressure Reducing Valves. Pressure reducing valves, although commonly used where pressure is an issue, are not always the best alternative. The pressure reducing valve has a close cousin called a “Back Pressure Regulating Valve” which monitors and controls pressure in a similar but different …
Providing the best and most efficient rinse in an aqueous cleaning process requires maintaining the cleanest possible water in the rinse. In spray rinses, this can be accomplished by using fresh water for the spray. A spray rinse with fresh water, although effective, is often not practical. Using a constant supply of fresh water is costly, especially if …
In a previous post, Ultrasonic Cleaning – Soluble Contaminants, I discussed the effect that ultrasonic cavitation and implosion play in enhancing the removal of soluble contaminants from surfaces. Today’s blog will introduce the effect that ultrasonic cavitation and implosion have on the removal of insoluble particles from surfaces. There are several mechanisms that can cause …
In this series on filtration I have not mentioned much about filter ratings other than to say that most filters are rated based on the minimum size of particles they will capture. It is important to know that a filter rated at 5 microns, for example, may not prevent the passage of all particles with a …
The most challenging applications for filtration often involve either very small particles or huge volumes of particles – sometimes both. The filtration of buffing and lapping compound residues from solution is a good example of such an application. There are a number of “specialty” filters available which may answer the needs of the more challenging applications. …
For any filter to be effective, the liquid being filtered must circulate or re-circulate through the filter in an efficient way. In a spray system, the cleaning or rinsing liquid usually returns from the filter directly to the spray head(s). This means that the liquid spray used to clean or rinse is as good as …
At first glance, plumbing a filter into a system doesn’t sound like a big deal. In fact, it really isn’t, but there are right ways and wrong ways to do it. Here are a few ideas. First, liquids should always be PUSHED, not PULLED through a filter. Most pumps used in industrial and precision cleaning …
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