RO/DI Storage and mixing:
Here is what I use, minus the Mag 2 that sits in the middle for filling mix tank, buckets and circulating
Fresh on the left, you can see the float switch and it is all run by a timer so the ro/di unit will run about 1 min every hour through the night till full then the float over rides everything
And mixed on the right, able to mix with a Mag 2 and a heater holder near the upper output.

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Richard
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My wife believed me when I told her it was only going to cost about $500.00. that was over two years ago and I'm still grounded.....