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I decided to use r/o water to solve my high nitrate problem. My tab water has about 16ppm of nitrate.
5 days has past since I started to use r/o water.
r/o water droped Nitrate to 4ppm, but it also drops pH and KH. especially, pH drops to 5.5.
I'm using NaHCO3 for KH and pH buffer, and add about 2.4g per 30 gallon everyday.
acctually, it's really effective, but only short term. it raise pH about 0.6, but ther pH recovers in several hours.
is there other sources that last longer?