Ph keeps dropping rapidly

R

Rdot03

Well-Known Member
So it's day 31 and just before the day 21 strip I was noticing my leaves were going light green on me so I added 25% mag to my feed because I run leds. Before flip everything was green lush but after stretch that's when I began to notice it but I thought it was because of the red in the spectrum it was an illusion of color. That's also around the time I noticed my ph was dropping from 5.8 to 4.4 and ppm rising from 950 to 1000 over 24 hrs.. so I started phing up to 6.3 and only adding back water to lower ppm.My water Temps stay around 65 to 67. After doing a lot of research I came up with my lighting was too intense and was causing the lime green leaves bc I kept them 4" away dimmed to around 75%. Since Sunday I've raised the lights 9" above and lowered them to 65ish%. I drained all but 2" of water out of the system and just added back PhD water to 6.3 my ppm was at 340. This morning I checked and my ph dropped to 5.7 and ppm rose to 360. I'm thinking they were locked out and all the food they want was gone so I added 5gal of ph 6.3 ppm 750 solution back to the res which should raise the over all up to about 500ppm or less. I'm stumped. I'm running two identical systems only difference is style of lighting. Any thoughts on what could be causing thing.. all throught out veg ph would raise and ppm lower if not stay steady for atleast a week. Room temps around 87 leaf surface temp around 84 85 humidity 45-55% co2 950-1150
 

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curious2garden

curious2garden

Well-Known Mod
Staff member
Rdot03 said:
So it's day 31 and just before the day 21 strip I was noticing my leaves were going light green on me so I added 25% mag to my feed because I run leds. Before flip everything was green lush but after stretch that's when I began to notice it but I thought it was because of the red in the spectrum it was an illusion of color. That's also around the time I noticed my ph was dropping from 5.8 to 4.4 and ppm rising from 950 to 1000 over 24 hrs.. so I started phing up to 6.3 and only adding back water to lower ppm.My water Temps stay around 65 to 67. After doing a lot of research I came up with my lighting was too intense and was causing the lime green leaves bc I kept them 4" away dimmed to around 75%. Since Sunday I've raised the lights 9" above and lowered them to 65ish%. I drained all but 2" of water out of the system and just added back PhD water to 6.3 my ppm was at 340. This morning I checked and my ph dropped to 5.7 and ppm rose to 360. I'm thinking they were locked out and all the food they want was gone so I added 5gal of ph 6.3 ppm 750 solution back to the res which should raise the over all up to about 500ppm or less. I'm stumped. I'm running two identical systems only difference is style of lighting. Any thoughts on what could be causing thing.. all throught out veg ph would raise and ppm lower if not stay steady for atleast a week. Room temps around 87 leaf surface temp around 84 85 humidity 45-55% co2 950-1150
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Reservoir pH drops are frequently due to a pathogen. I usually disinfect with Chlorine Bleach. But you can't let the disinfectant levels of Chlorine Bleach touch your plants it would kill them.

After that I'd add some pool shock to my reservoir (I run a sterile grow) pool shock is Calcium Hypochlorite, household bleach is Sodium Hypochlorite. Sodium isn't good for plants that's why it's better to use non stabilized pool shock for ongoing prevention. Search pool shock here for the right dilution for maintenance.
Hope that helps and best of luck
 
Neddygrow

Neddygrow

Member
The first time I did DWC I used the exact same buckets and the yellow lids let way to much light thru and caused root-rot and mold on my roots, that was once I went into flower, with the temps and you pH you mentioned you might have root rot issues.
 

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