Discus Buffer, 4 kg / 8.8 lbs Adjusts pH to the acidic range ideal for discus Helps to replicate ideal discus environment of low pH and low GH (general hardness) Will lower pH and keep it lowered; Also softens water by precipitating calcium and magnesium Use Seachem Discus Trace to restore proper level of trace elements required by thriving healthy discus 250 grams treats up to 800 US gallons