For example - it takes around 1-1.5 gallons of evaporation to increase my specific gravity by .001 in about 100 gallons of water. My tank evaporates almost 1.5 gallons per day in the summer. If I was to not add any top off for three days then my SG would rise from 1.025 to 1.028. I try to keep it between 1.024 and 1.025. Another thing to remember is that RO water has a low ph and adding it in large quantities could cause a swift drop in your tanks ph by 0.1 or 0.2 or even possibly more.
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