Ppm Goes Down When I Add Nutrients?!?

[BigPunkin]

I recently started keeping track of the ppm of each nutrient i add to the gallon of h20.

Base: (plain h20): 79 ppm
Week 1: Day 1: Flower:

Sensi Coco Bloom A: 10ml B:10ml = 797 ppm
Bud Ignigtor: 8ml = 641 ppm
Bud Factor X: 8ml = 696 ppm
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So is my pen shot? Why did the ppm go from 797 to 696 in the final measurement i took? I normally just measured after adding everything to the gallon, but this grow i decided to measure after each individual nutrient i added to a gallon. I been doing this since week one of veg to week 1 of flower and it always does this. I'm not sure if this is normal (my spidey senses tells me it's not), or if my pen finally shot its wad?

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[Necromancer]

When you add all your nutrients together (to your water) does it coincide with the ppm on your nutrient chart for the nutrient water rastio?

 

[johnshun]

is your ppm reader reliable/calibrated? I've seen ppm going down a little bit (maybe 10-20ppm) when using pH UP, but never seen ppm dropping that much after adding more nute.

 

[chemistry]

Are you in DWC?