Fluctuating ph in E-B drip conversersion

short time reader first time poster, my issue is my p.h rises quickly and stops about 6.7 to 6.8 where . I make the adjustments get everything right and within 2 hours its right back where it is , I am using rock wool formula 1 my medium is 6 in. rockwool cubes surrounded hydroton in 12 in net pots I am in a 25 gallon res. can anyone share a pointer or two as to what direction I should be heading.
p.p.m. are steady at 800
and there isnt any algae growth
sorry no pictures,,,,,,,

could be ph rebound nutes can cause this just readjust ph

Well I don't do the ppm thing and only grow Habs in the Aerogarden to munch on along with the Pintos and Cornbread..but I listen to whut a lot of these exspurt rope growers have to say. The Rock Wool and rocks are both high on the Ph scale and will influence your water unless you soak and dump..soak and dump....ad infinitum etc. Just nearly got to suspect all them high Ph toys are adding to your woes. Cure would of course be the Hempy Bucket method. You dont have to worry about none of that stuff. Axe the White Widow Lady. I'm just waiting for the HPS bulbs to go on sale at HD..then gonna go to one which dont know me and pay in cash. That should work. Then I just got to smuggle all this stuff past the warden. Figger to be in bizness in no time if the Lord's willing and the creek don't rise too high.

Big Wheel

the problem was so simple,from my last grow 3 years ago my hanna combo pen had taken a shit it was in need of replacement probes so even with the calibration my ph probe was getting an improper read.
it was readin 4.4 and was really bout 8.8 now the prob is fixed and and the lady are fine 3 wks in flower and doin what they do

Well thats great news. Glad you back on the tracks.

Big Wheel