25% water changes with 4KH water is only levelling off the tank's KH at around 9-10. Next water change will be strictly RO+Equilbrium. Seems that tank's KH increases by 0-0.8 per day.
Built an excel spreadsheet to calculate effective KH after water change including the increase based on the days since last water change.
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August 19, 2014 23:12