The PPM in your tap water is the same whether you have a tablespoon or a gallon. The PPM of the solution from the nutrient concentrate will depend on the volume of water you mix with it. Need to keep in mind that PPM is always a calculated value not like EC (electrical conductivity) which is directly measured. This is why many prefer using an EC meter for measuring nutrient concentration versus a TDS (total dissolved solids) meter, which is an EC meter with a calculation algorithm built in. Unless otherwise stated on the label, the calculated PPM of the solution will assume mixing pure water with the concentrate. But to answer your question the final PPM will be additive and 2000 PPM would be correct.

Thanks a bunch Hank, that helped a lot :)

I guess I should have gotten the EC meter instead of the PPM but I got a really good deal on a Newport DSPH-3 (desolved solids/PH) that I couldn't pass up. Although I'd imagine I could just get the conversion formula from the company and reverse the calculation (although I suppose I'd need accurate temprature readings too).

Thanks again

Dear Thedude27,
I have been growing vegetables hydroponically since the early 1970s. I gave conductivity meters away because I could never correlate its reading with what I knew was in the nutrient. I place great faith in a properly calibrated pH meter.
I invite you to have a look at my web site from Australia.
I use coarse sand as a medium and mix all of my own nutrient solutions ... and you can do the same. I even show you how to make your own system (without using bleach bottles).
Jimr007
Australia.

Here is a link that might be useful: Simple Sand Hydroponics