ph won't stay down

Best on the market, 30ml takes my 40g rez right where i need it. Compaired to the orange stuff that took over 100ml.
Great information for noobs like me who have never mixed a 45-gallon res before with nutes.
The idea mixing in a pH Down little by little so as not to overdo it and ruin 45 gallons of mix was really bothering me, as I'm just preparing for my first run... LOL
 
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