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RO reverse osmosis pure water machine (water purification machine) TDS value is high, there are two main reasons:The RO film has a first water infiltration process, membrane materials production in this period a small amount of residual substances dissolved in water will be washed out, if the use of wet film, film inside the preservative will dissolve in water washed out, this process usually takes 1 to 2 hours, the TDS external performance for pure water gradually reduce.。