A long time ago I couldn't keep diatoms off my sandbed untill I bought my RO/DI unit.
Since then my tanks have always been healthy and algae free. I wouldn't run a tank without one.
I think it's really important to have for purified make-up water. Pure H2O leaves during evaporation so it's leaving all the impurities behind which must build up overtime. It's good to have pure water for waterchanges too!
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