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Well, it's been 8 hours since I added 4ml of PH-Up to the reservoir to get the PH back up to 6.3 this morning. In the past eight hours, PH has dropped to 5 2. I just added another 3ml of PH-Up to the reservoir and will give it an hour to bubble before checking PH again. On the plus side, she...

@rkymtnman & @firsttimeARE - Your thoughts please. Assuming I proceed with a RO flush tomorrow (two reservoir changes x 12 hours each), should I consider using some H2O2 during the flush to address a possible bacterial issue (if there is one)? I mean, is there a potential for damaging or...

@firsttimeARE - Can you expand on what you mean by "sterile res"? Is that the same thing that @rkymtnman is suggesting, running with plain RO water as a 24-hour flush?

@rkymtnman - Sorry for the dumb question, but I want to make sure I understand. Assuming my PH tanks again today and I go forward with the RO flush, how long should I let that run for?

@rkymtnman - If I try going the plain RO route tomorrow, should I add anything at all to the water, such as CalMag or Hydroguard? Also, I did find another source for my RO water. I have tested it to a PH of ~7.3 and a PPM / EC of 0 (zero). Right now, I still have tap water in the reservoir...

This morning, I pulled the air pump from the inside bottom of the cabinet and relocated it to the top outside of the cabinet. At the end of the day, I'll see if that made any difference. If that doesn't seem to work, then I'll try running straight RO water for a couple of days and see what...

PH last night: 5.9 PH this morning: 4.9 Another 3ml of PH-Up added to the reservoir and that only took me up to 6.0. Edit: Had to add another 1ml of PH-Up to reservoir to get PH up to 6.3. So that's a total of 4ml of PH-Up I had to add to the reservoir this morning. This is absolutely...

When I was using RO water, I didn't have to use any PH-Down when mixing up my nutrients; the PH would already be generally within range. However, when I switched to using tap water, I had to use about 4 to 5 ML of PH-Down to get my nutrient solution in range. In fact that's what I did...

@firsttimeARE - I am using GH PH-Up and GH PH-Down. @70's natureboy - For nutrients, I am using GH Flora trio (Micro, Gro, Bloom). They are supposedly PH-balanced. I went to my local hydro store today in hopes they would be able to offer help. Unfortunately, no. Their only suggestion was to...

I am NOT trying to keep my PH steady. Please understand, I already know that it's best for PH to range between 5.5 and 6.5. That is not the issue I am trying to find an answer for. The issue is that my PH is CONTINUALLY DROPPING SIGNIFICANTLY over a SHORT PERIOD OF TIME. I'm wanting to...

Are you able to calibrate your meter? Buy a new one? If your PH is not within a "correct" range, many of the nutrients you provide to the plant will simply be unavailable. Even the additional Cal/Mag you've been providing. PH must be within a good range in order for the plant to be able to...

Good morning, folks. Here are this morning's numbers, soon after lights on: Air Temp: 72 Water Temp: 67.8 Humidity: 26 PH: Dropped to 5.9 PPM: Dropped to 610 EC: Stable at 1.2 Water level: Dropped a bit more than a pint overnight Sunday is my normal reservoir change-out day, but since I just...

Good evening ladies and gents. Here are tonight's numbers at lights-off: Air Temp: 69 Water Temp: 65.6 Humidity: 29 PH: Dropped to 5.7, added 4ml of PH-Up to reservoir to get PH to 6.2 PPM: 630 ppm prior to topping off with RO water; after top off: 620 ppm EC: 1.3 prior to topping off with...

@rkymtnman - The cabinet measures 2.4 x 2.4 x 5.0. I have a 120mm PC fan that pushes fresh air in at the bottom rear of the cabinet. At the top of the cabinet I have a squirrel-cage extraction fan rated at 53 cfm. Based on the total volume of the cabinet (~28 cubic feet), I figure the...

Good morning, fellow growers. Another update. Yesterday evening, before lights out at 7:00 p.m., I topped off the reservoir with RO water and adjusted my PH to 6.4 (knowing that it would drop overnight). PPMs were measured at 600 and EC at 1.2. Soon after lights on at 7:00 a.m., I took my...

Thanks, @taproot . You are not being rude at all. This is my first time doing a DWC, and of course, I want everything to run perfectly. But it's obvious I have lots to learn so I welcome any and all input. Interesting how you mention that it can take several days to dial in a reservoir. In...

@taproot - As much as I would love to leave her be, I can't. I just took another PH reading and my PH is down to 5.7 from a high of 6.2 this morning. I expect the PH to drop even further to about 5.5 by the time lights go off at 7:00 p.m. tonight. And mark my words, when I check PH tomorrow...

OK, so after my adjustments this morning and letting things stabilize, here is where I'm at as of now: Water volume: 5 gallons PH: 6.1 PPM: 570 (.500 scale) (starting PPM of the tap water when I changed the res 2 days ago was 180 ppm) EC: 1.1 Water temp: 67.2 @firsttimeARE - I am using...

@rkymtnman - Yes sir, all of my nutrients and supplements were purchased new in August when I started this DWC. @firsttimeARE - Can you tell me more about this calculator you mentioned? I've been reading a lot about the Lucas formula but have not tried it. My goal all along has been trying...

Yes, sir. I use 2ml for every gallon of water, whether I'm doing a reservoir change or just topping off.