Thanks nalu86, Dempsey, Angry the Clown, and dbosman! I'd love any help spreading the link around.
Metrex's MSDS for Metricide indicates it includes surfacants. Are you sure Metricide 28 is safe for the aquarium?
But I don't know what you're entering into the spreadsheet to get this:
If I ain't mistake to get the same concentration of excel you need to mix 475ml of Metricide with 525 ml of water.....
The spreadsheet with 1.5% target for our DIY mix, using a 2.6% Glut. source (Metricide 14) requires ~577mL of Metricide 14 diluted with ~423mL water for a 1000mL DIY solution.
Let's do this together:
(% Glut target) * (mL final solution) / (% Glut in Glut source) = mL Glut. Source to dilute.
1.5% * 1000mL / 2.6% =~ 577mL.
Your proportions make 1.235% Glut. using Metricide 14.
The spreadsheet and this calculator give the same results if you change the Intended Concentration (B7) from 1.5% to 1.6%. I'm not entirely convinced Excel is exactly 1.5% Glut until someone pulls out a spectrometer (and the difference between 1.5% and 1.6% is not significant), Azoo's and EasyLife's recommended dosing are in the same ballpark, and until now I had doubted anyone would freak out over 0.1% of something.