PPM on the RISE AGAIN!!

Ok, here is my dilemma.....
I am using the Ebb & Gro bucket system with a 210 liter reservoir (55 gal). I am in week 6 of my Veg and my PPM will rise after topping.
Initially I'll set my ppm at 1900 (5.6 ph--tap water is 170 ppm) leveled off around 180 liters and the plants love it. The PPM will drop around 50 ppm every feeding for 3 days. On the 3rd day my water level has dropped approximately 100 liters so I top off. Now....here is where the issue begins. I top off with Sensi Grow A/B until the PPM reaches 1500 or so. Now after feeding them the first time the PPM will stay the same and the next feeding it will RISE about 10-20 PPM and every feeding after that it will rise 20-30 PPM until I change the reservoir entirely. I cant afford to change my reservoir every 4 days. Why is my PPM rising after I top of my reservior?? (when I top, I use tap water. Also using Advanced Nutes.

just top off with water no nutes and ph as necessary. your ppm's rise because your plants are using the water and not the nutrients in your solution. you will save yourself nutrients and dough

I agree with Moses....only top with plain water...add nutes back on a schedule...usually at Rez change.

Thanks for the input! Will try it.

You aren't getting a burn at that high of a nutrient level?

My ppm is between 2000-2300 during the 3rd week of veg...I think it all depends on what you are using...I use FF so a lot of the ppm comes from miconutrients not the big ones that usually do the burning.

.......Im not getting nute burn. I gradually increased my ppm every week which peaked out during week 5 with 2100 PPM. Plants love it too! ......and I did dilute my reservoir to around 1200 PPM and now my PPM is decreasing again, plants love it!!! Thanks!