My tank has DKH of 13 or 14 right now and I need to lower it. I have read I can use muriatic acid to do so. I found a formula by Randy with the following example.
"Yes, you just add the acid. Be very careful with straight muriatic acid. It can easily burn you, especially your eyes.
The "acidity" (that being essentially negative alkalinity) of muriatic acid straight from the bottle is about 11,000 meq/L.
So adding 1/11,000 of the water volume as this acid will drop alkalinity by 1 meq/l (2.8 dKH).
You want a drop of 13-7 = 6 dKH, or 2.1 times that amount, so you'd add 1/5,100th of the water volume.
13 gallons ~ 49 L
1/5100 of 49 L = 9.6 mL
So I'd add 5 ml and stir well for a few minutes and see what alkalinity you get. Then dose again assuming it seems on the right track.
You'll need to aerate well after adding the acid to blow off the excess CO2 and bring up the pH.
Now for my tank system at 260gallons its probably more around 270 gallons but Id rather be on the low side.
So adding 1/11,000 of the water volume as this acid will drop alkalinity by 1 meq/l (2.8 dKH).
260 gallons ~ 984 L
1/11,000 of 984 L = 89.45 mL
I will dose 1/10 of it at a time at most and see how it falls. dose 1/10 wait for PH to raise dose another 1/10
Because it will drop my PH a bit and I dont want to drop alk or ph to fast. PH sits steady at 8.4 during the day so after I dose the first 9ml i will see how that drops my PH and go from there. I also was thinking I would do this over a 64hr period dosing no more then 30ml per day.
"Yes, you just add the acid. Be very careful with straight muriatic acid. It can easily burn you, especially your eyes.
The "acidity" (that being essentially negative alkalinity) of muriatic acid straight from the bottle is about 11,000 meq/L.
So adding 1/11,000 of the water volume as this acid will drop alkalinity by 1 meq/l (2.8 dKH).
You want a drop of 13-7 = 6 dKH, or 2.1 times that amount, so you'd add 1/5,100th of the water volume.
13 gallons ~ 49 L
1/5100 of 49 L = 9.6 mL
So I'd add 5 ml and stir well for a few minutes and see what alkalinity you get. Then dose again assuming it seems on the right track.
You'll need to aerate well after adding the acid to blow off the excess CO2 and bring up the pH.
Now for my tank system at 260gallons its probably more around 270 gallons but Id rather be on the low side.
So adding 1/11,000 of the water volume as this acid will drop alkalinity by 1 meq/l (2.8 dKH).
260 gallons ~ 984 L
1/11,000 of 984 L = 89.45 mL
I will dose 1/10 of it at a time at most and see how it falls. dose 1/10 wait for PH to raise dose another 1/10
Because it will drop my PH a bit and I dont want to drop alk or ph to fast. PH sits steady at 8.4 during the day so after I dose the first 9ml i will see how that drops my PH and go from there. I also was thinking I would do this over a 64hr period dosing no more then 30ml per day.
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