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Yes, 3%W/V is 30mg/mL and conveniently to dose 0.2mg/L at 150L is 1mL per day. You'd then dilute with 23mLs for every 1mL so a one week container would contain 7mL of strait stuff and 161mL of RODI totaling 168mL and again that's 7 days worth. That's the math I came up with anyway.I found a bottle of ammonium hydroxide from the supermarket but it doesn't tell the strength. From a little research I'm finding that most household solutions are3%. (I'm hoping this is a safe guess!).I'd like to ask for someone to confirm my math:

3% = 30mg/ml. Tank vol = 150 L I want to dose 0.2 mg/L per day.

So, 150L x 0.2 = 30 mg. So, I need to dose 1 ml (divided) per day.

If this is correct, then I will dilute it so I can dose 1 ml every hour (for 24hrs/day):

1 ml div. by 24 = 0.0416 ml/dose. If I dilute it 1:23, then I could dose 1 ml 24 times a day to get 0.02 mg/L. (1 div by 0.0416 = 24; therefore, 1:23 dilution).

Is all this correct?Thank you!