PPM constanly creeping up during flowering

So Im running the advanced system on first hydro grow, I'm on day 40 of flowering and my ppm (using a Milwaukee tds meter) keeps going up thorough the day. I add ph'd water (keeping at 5.8ish) to bring it down and I just want to make sure this is normal h2o usage. I change water/nutes every 7 days as well as clean res. Ive gotten a bit of nute burn from getting bumped over 2k (my fault for not checking...) from like 1400 but in the span of 2 days, keeping it under control now. Again just want to make sure that my thinking is correct with the plants using constantly larger amounts of water driving the tds to a higher level while adding more 0ppm water to keep the tds down but still maintaining a correct balance of nute soln.

It goes from 1400 to 2000 in two days, if you don't adjust it? Does the Ph go down when the PPM goes up? It might be that 1400 is too high for your plants. Usually, if everything is perfect, the PPM will stay around the same or it will go down over time as the plants use the nutrients.
If your mix is too high, nutrients will build up as your plants use more and more water, causing the PPM to go up.

It just means your plants are drinking more water than nutes. No biggie, just monitor your rez more closely.

I ran into the same problem.. in aero my ppms usage actually lowered after my first couple of weeks flowering.. took me awhile to realize that i needed to lower it.
Now ppms are barely going down/raising each day

Cool thanks for the info, I have def kept an eye on it more since that and everything seems fine and the buds are getting fat and trichs are takin over. System was very stable prior to flowering, it would have same readings almost every day but a MH got added to the LED and kicked up H2O consumption. Thanks again for the knowledge homies!