Yield plus, pk 13-14???

Just wondering about E.C levels.
My medium is coco/perlite, I use Proganics Bloom for flowering at an E.C of 2.4 as advised on bottle, works fine been using it for a few grows with Ok results, and i want to start using Yield plus and Pk 13-14 the bottles for both say to add 5ml per litre of nutes but nothing about the E.C, so do i mix my nutes to E.C 2.4 then add, which will make the E.C higher or just mix to E.C 2.4 total ??
 
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