Do you add hydroguard Everytime you top off reservoir?
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How often are you topping the Rez and what size is it? 
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Topping off everyday adding 4 gal to daily. Running a 32 gal reservoir.
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Personally I have had better results by running a sterile grow adding a 100mls of 3% Hydrogen peroxide as needed per 50 litres on nutrient mix. At the beginning and whenever there is any root discolouration or smell.
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