3oz of HC-110 with 21oz of water = *roughly* 90ml of HC-110 with 620ml of water.
To convert to 1:31, add 2170ml of water. You already used 90ml of HC-110, so to make 90ml of it equal 1:31, you have to use 2790ml of water. You already added 620ml of water, so now 2790ml - 620ml = 2170ml of water left to add. = 1:31
You may not have a container big enough, so you could divide your current dilution into, say, fourths and divide the 2170ml into fourths and add it. For example, you have a total of about 710ml right now. Make it about 178ml each and add 543ml to each, or how ever you want to divide it up.
Clear as mud?? :-)
*Edit* BTW, the conversion is about 30ml = 1oz.
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Last edited by blackwave : 02-23-2009 at 16:22.