When I saw Burr posting about using hydrogen chloride (HCl) to drop KH, I was intrigued, so I went ahead and bought some. Iím sure Iím not alone here. I plan to dose 1 mL per 6 gallons of water to drop KH by about 1 KH. I am not sure what my % HCL I am dosing the muriatic acid I bought is a low fumes brand, with a proprietary amount, so I suspect itís less than 30%.
My tank tested at 3KH using a new API kit, changes color on the 3rd drop.
I have a 4 low tech tanks that have medium light, one tank in particular, always has some green string algae growing from the top of the wood which sits about 4Ē below a 10w cfl.
Well I was wandering... what if I drop in a dose with a syringe directed at the algae... well here it is just minutes after. Hang on filter was kept on, and output is directly over the top of this spot. See below, the light green/yellow spots took a direct hit.
Im definitely not going to be doing this on a regular basis, given the hazards of using HCl and well, you can only dose so much in the tank without seriously dropping pH.
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