Jun 10, 2016 0 comment

“We coat a product that is mainly made up of a cast steel material. We use a three stage wash with iron phosphate cleaner in the first stage, rinse then a seal coat. The question I have is, since production levels of this product are rising we see a increase in TDS in our first stage of the wash. Normal city water is at 180 ppm TDS and bath parameters are to be within or under 480 ppm. What appears to be happening is the TDS is rising for some unknown reason . We think it has something to do with the make-up of the cast steel or contaminents it brings into the wash.. I think maybe I answered my own question, but could you confirm this for me please?”


“It is not unusual for TDS to rise in washer tanks. This value represents the “Total Dissolved Solids” within a tank solution. These solids are in your water when you first charge your tank and they are added when they are removed from the parts that are cleaned by the system. This is expected and normal. When you achieve your limit on TDS just dump your tank. If dumping becomes to frequent, then consider inline filtration to remove the particulate. By the way, TDS should be checked in your rinse stages. Adjust your overflow rate to compensate for TDS levels in the rinse stages.”

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