dude, the easiest way i think, if you have never used epsom salts dont try to experiment, the easiest, mistake proof way is flushing at 1/4 strength grow big, or some of the other nutes on the list in that link, you already know how to flush im sure....this does 2 things, first by flushing with nutes, Grow Big naturally lowers your PH off the bat, second...if it is Lockout and say you just fed as normal like the link recommends, the roots wont absorb the nutes, at this point i had been advised to flush with the mix, therefore allowing the roots to take it all, the key here is having a dilluted mix so you dont burn...with this method my leaves cleared up in 3 days. i dont know much, i'm on my second go round, but i am learning a ton from these guys and all the info i have been given worked like a charm, with every issue i have faced, everything on RIU came in ACES! so if i can be helpful when i see a friendly have the same problems i had, im more than happy to share what worked for me