DubbieBoy Posted November 26, 2007 Report Share Posted November 26, 2007 I was making myself a 40dKH standard solution for use with a drop checker; I work in a lab so have access to very accurate scales/cylinders etc... I now have 5 litres of a 40dKH standard made with anhydrous sodium carbonate and ultrapure water (this stuff is so pure it leaches silicates out of glass bottles). Its commonly used as a 4dKH standard to indicate 30ppm CO2 in conjunction with a pH indicator solution, so what I have is 5 litres of a 10x concentrate sufficient to last me for, oh, about eleventy million years. Thought it might be of interest to other plant geeks out there so if anyone is using this approach to measure CO2 and would like some of this KH standard for themselves before I pour the remainder down the sink, sing out and I can send you some If you have no idea what I’m on about but are curious, here’s some background info for you. http://www.aquaessentials.co.uk/forum/viewtopic.php?t=437&postdays=0&postorder=asc&start=0 http://www.aquaticplantcentral.com/forumapc/do-yourself-aquarium-projects/32100-diy-drop-checker.html http://www.plantedtank.net/forums/general-planted-tank-discussion/42429-kh-standard-how.html - DB Quote Link to comment Share on other sites More sharing options...
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