Hi glamourjojo,
Personally i think RO/DI water system will be overkill for a planted tank, using anti chlorine with tap water should suffice.
You just need to dose fertilizers to your planted tank as needed.
My personal opinion is that RO/DI water system is mainly used for shrimp keeping (particularly those sensitive type) and marine tanks, as hobbyists needs to control the water conditions for these 2 type of tanks.
Hope this info helps you.
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