6 gallons of fresh nutrient and calmag after completing a full flush of reservoir and clay pebble media, remote fogger running 24 hours, watering 30 minutes three times a day. Normal fresh well water unadjusted ph is 6.1 and 40 ppm. This issue started the start of week four. I’m getting ph down today but flustered over this spiking.
3 Likes
Several things could be causing this and would recommend the starting PH be 5.6-5.8. Warm and a stagnant mix can have considerable drift 
1 Like
PPMs below 100 don’t produce a reliable reading. There’s not enough solid material in your water to give a pH.
The water unadjusted will simply adopt the pH of wherever you’re putting it (in your soil, or your plant root zone for hydro, for example). If you want to know and be certain about your pH, add something (silica, CalMag) to the water to get the PPMs over 100, then adjust the pH to the target from there.
1 Like
that is about the time in my setup that she has enough roots to manipulate the PH up or down…also what @Graysin said about low PPM water is hard to get a good PH reading…
1 Like
The 6.1 and 40 were starting points prior to nutrients. I had to drive 3 hours round trip to get the ph down and silica. The reservoir was half drained and water added. Numbers were 6.3 and 260. I’m adding some ph down to get a feel and the last check ph was 6.1. Tomorrow I’m draining everything and washing off the clay pebbles. The refill will be in order, silica, calmag and nutrients. Ph will be adjusted last. I’m hoping for some recovery and a boost in growth when the ph is 5.8 and the ppm is between 750-900. Thanks for the input from everyone.
1 Like
My ph drops constantly when I’m in bloom. I use jacks 10-30-20 and the ph will not stay in range. I have been growing flood and drain 4 years and still haven’t figured it out. I gave up last year and bought a low dollar doser @Wizbang
I just have to buy a gallon of ph up during flower. I use a 25 gallon reservoir also. The ph is a little high because I just changed the solution and the silica raises the ph for a little while.
2 Likes
A little ph drift is normal, i would suggest a larger res. The drift ill be less ans not as fast. Also light getting into res and greating alge etc can cause ph problems
1 Like