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pat w · 09-16-2010, 12:06 PM

All I know is my 4Dkh solution reads in the vacinity of 7.6 pH with ambiant CO2 so it must be something else. If it's PO4 then no. The KH in a drop checker must get its hardness from carbonate or the KH/pH/CO2 chart relationships are invalid. Might as well use tank water.

Add 6g oven dried (325 deg. 1 hour) baking soda to 1000ml distilled water. = 200 Dkh water
Measure 490 ml distilled water and add 10 ml of the 200 Dkh water. = 4 Dkh water
Measure 390 ml distilled water and add 10 ml of the 200 Dkh water. = 5 Dkh water

Pat

09-16-2010, 12:06 PM	#4 (permalink)
pat w Senior Member Join Date: Nov 2009 Location: Gulf Coast; Daphne, AL; East Bay across from Mobile Posts: 120 iTrader Ratings: 3 iTrader Positive Rating: 100% Plant Points:	Re: 4Dkh from Ph4? All I know is my 4Dkh solution reads in the vacinity of 7.6 pH with ambiant CO2 so it must be something else. If it's PO4 then no. The KH in a drop checker must get its hardness from carbonate or the KH/pH/CO2 chart relationships are invalid. Might as well use tank water. Add 6g oven dried (325 deg. 1 hour) baking soda to 1000ml distilled water. = 200 Dkh water Measure 490 ml distilled water and add 10 ml of the 200 Dkh water. = 4 Dkh water Measure 390 ml distilled water and add 10 ml of the 200 Dkh water. = 5 Dkh water Pat