After water drain ppm and ec too high?

if it keeps building up, it's your habits that are causing it. either not giving enough water each time to saturate entire substrate or fertilizing at too high of concentration relative to frequency of application. 2 competing rates of change (bit more complicated) - rate of use vs rate of provision. if provicsion is too high you get a tox. if provision is too low you get a deficiency. it's easy to recognize the how/why these things occur, then adjust in an intelligent way to avoid it next time.

Levels were all the same I had to flush the plants, good to have a TDS meter thank to Jungle that made me buy it. Readings of the flush were all Drain of plant #1 15L total only water All stats above are drain info Water was always Ph 6.28-6.30 Ec 238-270 Ppm 120-135 Drain: 1 flush Ph5.35 Ec3880 Ppm1950 0.19 2 flush Ph5.33 Ec4190 Ppm2.100 3 flush Ph5,50 Ec2710 Ppm1360 Salt0.13 4 flush Ph 5.62 Ec 1767 Ppm 885 So now my question is why the PH of the drain was always off?

you likely be dealing with salt buildup around the roots you need to flush