I use pure RO several weeks after the start of a new tank.
When the tank is new, I know that I will do many daily or every other day water changes, so it seems silly to waste the RO water, so I run my hose thru a charcoal filter to remove the chlorine (convert) an some other impurities while doing on average every other day clean up and water changes. Once the plants have acclimated and stopped melting leaves and showing any die off, I then start to change out about 20% of the tank water with PURE RO about every 3 days and from then on out, it is PURE RO into the tanks with every water change. I have been using ADA Green gain and Green Bacter into the RO make up water and dose with Pfertz Micros every other day. This is a recent change from dosing with the full line of Pfertz and the new additions of the ADA products, but the RO has been steady for about 18 months and I feel the stability benefits are HUGE and well worth the initial investment of the product.
Plus I now have drinking water right out of my sink top and I have a line with ball valve right under my sink that I fill all my nano tanks directly from and fill up my 5 gallon sparklets bottles for my water cooler. Plus we cook with it and fill the ice trays. I do have a permeate pump on mine so if I ever get a fridge with an ice maker and in door water / ice dispenser, I am set.
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