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I have a DI filter for my tap water. Will this suffice to produce, or should I invest in a RO/DI filter? I plan on (for the time being) running a FOWLR tank.
The DI will produce good water. The problem is, unless you already have VERY good tap water, it will exhaust quickly. DI is a costly way to make water in most cases. The RO membrane will remove most of the dissolved solids from the water before it gets to the DI, which will make the DI last a lot longer.