Hey Diverdude,
As you know I only have a 2 stage filter with membrane. So a basic RO filter system for my big system. I never have had a problem and my final TDS is only 1-2 ppm. So you don't need it in my opinion, but if you can plumb things to run the DI for the tank and then have RO for drinking, then do it that way.
If you have it, use it!
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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