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I'm not, using water straight from the tap. First i dosed 8/16 like you do, which made it 100ml micro and 200ml bloom. Then i dumped that out and put in 1/2 strength (50ml and 100ml respectively). I've got two meters to check against, granted they are both the same but the wife has 0 issues. I...

Last update for me in this thread. pH went from 6.6 down to 5.5 over the course of about 24h, no signs of it stopping. So i'm just going to give up tbh, wasted a lot of time, energy, nutes and money on her and she's not giving me any indication that it's getting better. Thanks to all the tips...

It happened every time you grew in hydro or just during every grow? Just want to know out of curiousity. I get what you're saying, i'm in the process of putting together an automated pH dosage system, it should help quite a bit. Still, seeing the plan suffering because of something and not...

Ghost as in what is causing the issues i'm having. I've got no clue and nobody else seems to either so I call it a ghost.

Really? Is it like that with all the strains you grow or just one? This is the first time im running into this , all the other grows have gone quite fine but nothing like this. I just changed out all the water, put in 1/2 strength of the lucas ration so 50ml of micro and 100ml of bloom. No pH...

It's fine dude. I'm quite pissed at this myself, banging my head against the wall. I've replaced the water and put in 50% of the full lucas formula along with some calmag. But we'll se what happens and if anybody else has a clue. Also, i'm running a 3600/l hour airpump with 2x 150mm stones (1...

Pics as requested.

My EC/TDS meter runs on both 0.5 and 0.7 scale. I measure EC since it's universal and it can get confusing using the TDS scales when talking ppm. I agree, when people post the ppms of their plant and not the scale, a lot of issues can be brought forth. That's why i'm just using the EC values...

I think GHE micro contains some cal/mag but not much. Hey, Not gonna argue about the advice bit, I think I did and looked into a lot of the things people gave me advice to do but if you're in a differnet opinion - so be it. Yes, i'm not a master grower but I do think I understand the...

I appreciate the help, sorry I sound so negative. I agree, this problem seems to be quite illogical tbh. I was looking through deficiencies and saw that a copper def. seems to fit my description pretty well. Altough, everybody seems to point as a Cu def. is caused by a pH issue and is basically...

Thanks. But chaning the res every 7-10 days and with the size of it, 13 gallons, shouldnt that be more than frequent to prevent all the water from becoming bad or filled with salts or other buildups? I mean, in the last like 6 days i've changed the res twice.

Came home and measured, pH had been lowered to 5.3 now, over the course of about 8 hours. Added a bit of fresh water, since the level had gone down. No other change. I'm really dumbfounden by this. I have absolutely no idea what is causing the pH to drop all the time and no matter what I do, I...

A smaller update. The pH has dropped from 6.1 down to 5.6 over night. EC is sitting at 1.8mS like yesterday. I have not added any pH down/up to the solution, at all. What I did add this morning is 2 bottle caps of GHE calcium/mag supplement, which would be approx 10ml in 13 gallons. Maybe that...

Yeah, maybe. It's really strange though because the plant itself looks good, nothing strange about it at all but the pH is just dropping below what is considered within the acceptable range for hydro. I just took another measurement now and it's still at 6.1 so this will be interesting to see...

Well, calcium already exists in the tap water but sure, I guess some parts might be left out but from what i've read, it's not something that is an issue now. If I compare the NPK ratios of Micro+bloom and micro+gro i'm not missing out on a lot. Also, i'm kind of at a dead end here. I dont...

Another update. The bucket with plant that has the ugly looking leaf (pic in post above) was sitting at pH 5.4 this morning while the other one, which is fluctuating very very badly, has dropped down to a pH of 4.4 over the course of about 10 hours. I'm thinking I need to dump out the water...

My pH swings dont suprise you? What do you mean? I wouldn't call them "swings" as in they're up one day and down the next, they're just going down and that's the problem. I've had bad pH meters before but I usually run 2 meters just to reference them with each other. Lower chance of both being...

Sure, it just doesn't seem logical to me. Seeing as I'm not running hot in the tent, more than enough ventilation, automated RH system etc. But yeah, sure, might be the case for some very strange reason.

Bought it new a week ago, I calibrate every 2nd week. I re-calibrated it yesterday just to make sure the meter isnt an issue.

Sure, might as well try right? A little update. I measured the pH in on of the buckets, which sat at 0.8mS, and it was 5.3 this morning and now, about 8 hours later it's dropped down to 4.9. Sure that the pH drops but over 8 hours and a drop of .4 - that can't be normal. The microsiemens (mS)...