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HYDRO Water acidification with plants in flower - air pump inside the growing space

End of day update:

over the course of the day pH started off at 6.4 after changing out water and replacing it with fresh nute water.
by 1 hr before lights out, pH was 5.7

drained another 5L water out and replaced with fresh nute water, last pH 6.2 before lights out.
 
Calcium can be a PH buffer, I think the GH line has buffers as well.
How are you keeping your deep culture water cool?
 
Might want to check on that with an aquarium thermometer. I can say for a fact that the floor of your grow room is not the same temperature as the ceiling.
 
ambient air temp in F and C
 

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Light hits the buckets and warms up the reservoir. The reservoir contains a smaller volume than the tent has, so it gets warmer faster.
Lastly, water is dense with a higher entropy value than the air has. These are a few reasons why the water and air temps are different.
 
i agree Toker,
just havnt got the thermometer yet.

light is 400W LED... (190W power draw)

water feels cool to the touch... but thats not a good reading....
 
have just drained 5L out of the system, pH was at 5.2.

topped up with fresh nute water ; pH is 6.4 now.

have added 40ml of AN Sensizyme this time round... (on 20L of water)
roots were looking like they had been partialy affected by what looks like root root.

can't hurt to try...
 
Yes. This would explain the PH swings. I think water temp may be the issue. Do the roots smell unpleasant right now?
 
they didnt smell bad as such...

last time i changed water i took them out the tent as usual while i cleaned the system.
roots have brown patches on them.

then again, they have had for a few weeks now, even before switching to 12/12.
didnt interfere with pH when on 24/0.

when i took them out, i did carefully look at those brown patches...
looked slimy but not to the touch.

i'll lift them out tomorrow morning and take a pic... when i check pH again.
 
So the nutes can leave a brownish film on the roots that easily washes off. Another way to tell is nute slime doesn’t smell unpleasant, but root rot does.
 
Been trimming roots today...

slimy, earthly smelling bits...

case of partial root rot as half the roots were brown & slimy, the other half were good.

those that were brown & slimy were also tangled with the healthy roots...

after trimming gave the roots a good wash down, back into the res.
have sensizyme in there already.

will change res tomorrow after a good clean of the system with H2O2...

fresh dose of sensizyme & also some voodoo juice to get the roots growing back.


So, i guess the question changes then to:

will partial root rot cause big pH swings, as opposed to CO2 from respiration of the plants during lights out?
 
today's update:

Cleaned the entire system!

- let waterpump, all water tubes, airstones, more than what sits in the water of the air tubes soak for an hour in sterilising H2O2.
- cleaned out the buckets and res with H2O2
- let the assembled system run an hour with serilising levels of H2O2 water while bubbeling air.

- while i was at it, checked the quantity of water (22L) and waterpump speed to let the water level in the buckets come about 2cm below the netpots,

- drained the H2O2 water (which was clean) and added prepared water ( 5L with 90ml Si+, 10L with 37ml Ph and another 10L plain water)

- added the nutes (30ml CalMag, 90ml Si+, 30ml Micro, 15ml Gro, 30ml Bloom)

- water pH is 6.4
- ppm = 1010 (might be a bit high)

- 40ml voodoo juice, 40ml sensizym (need those trimmed roots to grow back!)

grow tent air temp = 20.6C / RH = 48%.

lets see how this progresses.
 
whats the european equivalent to hydroguard?

been trying to find that since reading about it here on GWE but never found the product.

closest i think i found was the sensizym....
 
Don’t really know. But the active ingredient is Bacillus bacteria known as Bacillus Amyloliquefaciens.
So that’s what you want to look for.
 
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