Remember that deionized water has been....well... deionized  And as nature would have it...it REALLY, REALLY wants to bond with SOMETHING...anything...Bueller..Bueller.... Sorry... I need sugar!
In any case, IF you kept it in a sterile environment, in a container that is not susceptible to breaking down, and AIR TIGHT, you may be okay. But even the snap on trash can lids, salt bucket lids etc. do not provide enough protection.
All it takes is for airborne particles to get in, or anything like a dirty hose, heater, powerhead, net, etc. that is not sterile, to touch the water..and VIOLA.. the deionized matter has now found something to bond with. BINGO.. TDS rises!
Dave
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"Fins to the left...Fins to the Right, I'm going home to play with my reef tonight..."
If you're looking for me, and I'm MIA from the board, email me at JustDavidP (at) gmail (dot) com.
Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
