+1 to brs.
You may want to consider adding 2 DI units. This sounded silly to me when I first started a year ago, but now it makes perfect sense. What you will find is I have the latter stages of your DI exhausting your tds will creep up. For me from 0 to 1 or 2 even though there is still some "blue" resin left(assuming you get the color changing resin). I would change out the resin because I only want 0 tds water.
Now with 2 units, I can let that first one totally exhaust because the 2nd one has me covered. Now I pull DI unit 1 and move DI unit 2 into the first slot. I refill the exhausted DI 1 unit and now place that one in the second slot
Now, the resin is not that expensive and it will take a couple of years for this to pay off financially, but for 40 bucks its an extra layer of insurance and you don't have to pay as close attention to when your DI goes. My unit is automated to fill my storage tanks and sits in the basement by the furnace so I don't think about it a lot.
I just added this 2nd DI a month ago because my RO membrane went and I didn't realize it. It chewed up my resin and was then filling my storage tanks with 25+ tds water that I did 2 WCs with. Realized it when brown algea showed up in my tank.
I also use close to 60g of ro water /wk for WC and ATO.
Just my 2 cents..
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