Hello to everyone. Does hot water in summer expires very quickly di resin ? I recently bought a 6 stage ro/di system, the last two stages are di. When i was flushing it, in 1 hour time the di resin changed colour from blue to yellow . I was really impressed how the colour of the resin changed colour !! the tds meter input was 938 and the output was reading 200. Can you please give me a hand with this ? Any suggestions ? Thanks in advance.

