As long as you can get 0 TDS, then the extra stages are just costing you money.
My guess is that not many people on Canreef have more than 1 DI stage.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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