checking ec

wonderin when most people check there ec. before or after adding additives.
I use gh 3 part with some additives. mabey this question is a little dumb cause i guess i check my res ever so often and ajust, so all the additives are already in it, so i guess i was just wondern kinda when you clean that res and all your plants get that fresh nute mix up. mine always like a nice stream of fresh nutes.
so the question comes down to

should I put the bask nutes in first and check the ec then add all that organic and inorganic nutes in after, then ph adjust, feed.

or

mix the base nutes add additives ec, ph adjust, feed

(readin somewhere that the ec reading of organic nutes is imaginary)

i am high.

does this make any sense or am i just ramblin.
thanx a bunch

any one understand.
or am i crazy at least someone say something. make fun of me or let me know what your ec checking methods are.
please.

http://cannabis.com/growing/ph-what_is_a_good_ph_EC_tds_meter.html
http://cannabis.com/growing/ph-What_are_the_differences_between_ppm_and_EC.html
http://cannabis.com/growing/ph-ppm_ec_cf_chart.htmlv

All I have to say is make sure your watering solution (With and with out nutes) is properly pH'd before you apply.

Keep Smoking and Peace Out,
SMG