how to "up" the PPM?

when i mix my nutes, the PPM comes out low. thats even after i add some root 66 to it. what can i use to bridge the gap? what do u use if your PPM is 900 but it beeds to be 1150?

more nutes.

So let me guess....More water to lower the PPM ?

Less is more so consider 900ppm a blessing, assuming you're not on the NaCl scale.

I agree with HB; I mix my solutions to 850ppm and it rises to 1000 by the end of the week (when the solution gets changed.) Less is definitely more and it is a good practice to give your plants some room for error.