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I'm would like to know what type of DI Resin is in these filters. The reason I'm asking is when I installed the 1ST filter it did reduce the total dissolved solids to 000PPM. After several days ( about 5 days) I rechecked the TDS and it read the same as the RO membrane output. I put the second DI filter in. When flushing it out the water was an orange color. After flushing for 10 gallon of water it read more than the RO membrane TDS.
What's up with it. Thanks Alex
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