Aquarium Fish :: View topic – R/O Units

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I’m raising African non-annual killies and as they all like a low Gh number I am going to buy a R/O unit. Now a couple of questions, My tap water is very hard, 220 ppm, do I need a DI unit? How many stages would you think I need? I’m planning on a 3 stage, 4 if I need DI, what additives do I need to reintroduce to the R/O water? What brand would be your choice? Where would you purchase it?_________________