Quote:
Originally Posted by rcalzadilla
While I wait for my certified 4dKH I have made my own batch using kitchen measuring utensils and TB's instructions.
It turned out over 4dKH so I added distilled water and tested, distilled water and tested again until it tested out 4dKH.
How accurate is this?
I am using it in my DC and it's looking good by using regent from an API PH test kit. Three drops regent + my 4dKH.
First it turned blue and after about 4 hrs turned green.
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There is no reason not to make your own 4 dKH water, provided you use distilled or deionized water, and have a good KH test kit. Since the measured ppm of CO2 is directly proportional to the KH of the drop checker water, even a 20% error in KH still gives a more accurate CO2 measurement than trying to do it with tank water KH and pH. I find it extremely difficult to arrive at 4 dKH water when trying to make it myself - I usually go through a half gallon of water before finally getting close. That's why I gave up the DIY method.