I went to store and filled a 5 gallong jug up with primo water . then i used my RO/DI unit to make another 5 gallons the next day. as it was starting to fill up i checked the TDS and it read 0. that was two days ago. so today i went to use that water as top off water and checked it again and it read 5-7ppm. Is this normal and or that bad to use if its still that low?
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