The Grow Awards 2026 🏆 
Ph drop after res change
Gzuscampstarted grow question 5y ago
Ph dropped hard 24 hr after res change @ 60%. Had changed 1 week prior due to high ec + slowly dropping ph and added another air stone. Turned off the air stone for an hour, no change so likely not acid rain situation. Ph up’d, plant never showed signs of being unhappy. Thoughts?
likes
Hashyanswered grow question 5y ago
I have had this a few times. I'm not sure what causes it but my theory is all to do with the nutrients. I'm thinking that the nitrogen increases Ph as during flower you use less N. I just let it drift down then PH up when it happens.
Gzuscampanswered grow question 5y ago
@hashy thanks, that’s kind of how I’m feeling about it. Plant looks happy and I had cut nutes down (ppm about 850, had been heavy feeder up to this point) as ec was rising and ph falling. No burn which is weird as everyone else seems to be running much lower ppm at all stages.
likes
Complain
Similar Grow Questions
Solved
Lungboi
Is my girl getting close to the end? Spike in EC and PH dropIs my girl getting close to the end? the EC reading goes up significantly while the PH drop significantly every morning when I check on my girl
I'm running DWC and she just finished week 13, autoflower White Widow ILGM and she is being fed around 1 EC
The picture is from the 13th3y ago
5
4
Solved
Grrrower
when to fertilizewhen is it better to start using fertilizers?Other. General questions
Feeding. Schedule
Feeding. Other
6y ago
1
2
Solved
heythere12345
Water pH questionI don't have any pH downs and my bottled water is 7.5 pH. Is there any way that i can reduce it with lemon juice or vinegar? If so, how many ml to 1 L of water?Other. Other
Feeding. Chemical composition
Feeding. Other
4y ago
4
3
Solved
grow3r
Calmag at week 7 after removal of leavesI have a 7 week blueberry auto only fed with sensi grow, bloom and carbloader throughout the recommended periods. Yesterday I removed some leaves as it was way too bushy so considered introducing calmag as two of the early lower leaves have started to yellow.. is this a bad idea?Feeding. Other
5y ago
1
1
Solved
nubrinnah
Harvest questionGrowing in coco, flushing for a week, trichomes now 70% milky 30%clear, last week 50% 50%, aiming for 90% milky 10%amber. Question: Should I feed nutes again and then flush again or just keep flushing till I get there? If I should feed, how long?Week 13
Feeding. Other
6y ago
3
Solved
Loulou84
Toxicity and pH issues.I'm pretty sure I have to much nitrogen in my soil and I think the pH is maybe neutral but I need to know how to test the soil. Should I flush her again and with how much? I also think she's beginning to flower 😉. 5 weeks old tomorrow. Help a newbie out again ☺️Feeding. Other
6y ago
3
3
Solved
guerrillawarfare
MOLASES FEEDINGI am using CANNA TERRA PROFFESIONAL PLUS, I have not added any organism in it,Should I feed molasses to it? I have read that molasses just feeds the soil and not the plant so is there a reason to do it? Does this soil contains any organism by itself that molases will help feedWeek 7
Feeding. Other
5y ago
1
1
Solved
GhettoStyle
friends please tell me why the leaves are this color!At first I thought it was a deficiency now I think it's an overdose!Leaves. Color - Yellow
Other. Other
Feeding. Other
5y ago
3
Solved
buddhi_coop
WaterIs it bad to make my water ahead of time ? I mixed my nutrients (big bud, formulex, bud candy & molasses) in with the water & have let it sit out for over a day. I heard letting it sit out gets the chlorine out (I put a towel over it though so my cat/other stuff would get in it)Feeding. Chemical composition
Feeding. Deficiences
Feeding. Other
5y ago
6
5
Solved
rockbo47
When to water in coco/perlite?How do we know when the plants need more water when grown in coco? Do I wait until the coco is completely dry up to my knuckle? (as in dig entire finger into coco up to my knuckle) or should I be watering when only the first inch or so of coco is dry?5y ago
2
3
Solved
NanoLeaf
Inoculate?What do you guys use as an inoculant?
Do you inoculate and why?Week 2
Feeding. Other
5y ago
1
3
Solved
VeggieTales
Watering in Super CoCoHey there fellow growers! So I’ve been trying to figure out the best watering schedule and volume 🧐I’ve been told to always water with runoff, go by weight, top inch dry, etc.
I guess my main question is runoff necessary when watering in Super CoCo?
All advice appreciated!🌱Other. Other
Feeding. Schedule
Feeding. Other
5y ago
1
1
Solved
Jahemoto
Reservoir PH dropping to fastI have been having issues with my reservoir Ph dropping from 6.2 down to around 4.8-5.2 with in 24-48hours
currently around 22c water temp and a micro recirculation pump (has a air input lead, if that's what you call them) but is always closed.
Any help would be a massive help.Week 3
Feeding. Other
3y ago
7
5
Solved
Aldo90
AN sensi line is confusing me can someone help ? Will I need to use grow with the autos ? Or shall I just use bloom part b ? Bloom part a is pure N ?I'm growing autos. Using AN sensi line. I've only ever used AN grow and bloom, but my grow shop nearby only had the sensi line available so I decided to buy them. I've gave my girls 2 doses of feed part a&b grow and they've showed signs of N tox. Can anyone advise me on AN Sensi4y ago
2
2