Doug....All RO/DI here. 100 GPD system and just 35 gal system volume so everything is still quite new and 0ppm TDS.
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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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