Useful calculator for GFO, carbon, alk, cal etc...

[GoFish]

Just thought I'd share this link. Ive used others before but couldn't find Brightwell in particular and have never noticed one for GFO or Carbon

MarineDepotCalculator (http://www.marinedepot.com/md_educationcenter_calculators_reef_chemistry_calc ulator.html)

[randallino]

Here is another calculator for alk ca and mg
http://reef.diesyst.com/chemcalc/chemcalc.html

[duncangweller]

Bulk reef supply has one too:
http://www.bulkreefsupply.com/reef-calculator