Well as bart 84 knows and it's good to see it's not just me but I see Alowe seems to be having the same problem I am. I have be using regular IO and my last batch I made came with Alk. over 13 dkh I believe it was closer to 14 dkh. I had enough so I sucked some water out of the make up and added fresh and this dropped my S.G from 1.026 to 1.024 my dkh was 12 now and my Cal was 495 at this point don't even care what Mag was. Now I have had enough and that is why I had the post earlier in the week asking about the D&D salt. You can try Muriatic acid to lower the Alk. in the water before water change here is some info. I myself am going to pick up some Aquavitro Salinity tomorrow as this salt at least is designed for 1.026 so all that goes in is for that mixing point because if the Alk is out what else maybe that I can't test.
Hi Randy
I am trying to lower my alkalinity of Reef Crystals from 13 dkH to ~7 in the hope of using Zeovit products. I got Muriatic Acid to lower the alk of my salt. Do I just add the acid to the water? What can be used to handle the acid? I have a glass dropper from my school chemistry lab can I use it?
My Reef Crystals Alkalinity is 13 dKH. I am using 8.79 ml of acid to drop it to 7 dKH. Does this sound right? My water change volume is 13 gallons (49.21 liters)
Thanks a lot for the help. I really appreciate it.
Vishnu
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.
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Randy Holmes-Farley