Alkaline soak-cleaning solutions and electro-cleaners generally accumulate considerable amounts of solids and organic contaminants, as well as floating scum. This last is normally removed by skimming. Solids can be removed by settlement when the plant is idle, followed by decanting (drawing off of) the fluid, and removal of the settled solids. Fluid itself is replaced periodically, as necessary, such as when sample analysis shows that it is reaching the end of its usable life. Where heavy dust loads are involved, continuous or periodic (batch) filtration, with a relatively coarse (50um) filter can show considerable economic advantages.
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