pH dropping - But why?

gr0w

Well-Known Member
Hey guys,

My last grow all I did was pH down, hardly ever had to pH up.
This grow is the complete opposite...??

I am using a stand alone reservoir that feeds the plants on a timer.

Info on my setup:
-System is Drain to Waste
-I am using Reverse Osmosis water
-I am using REMO CalMag, and general hydroponics trio nutrients. (Micro, grow, bloom)
-Using HydroGuard every res change
-Room temp is 70*F (tent is 78*F)
-Reservoir is outside of the tent
-have two large air stones in the reservoir

I am just wondering why, and what would cause pH to drop from 5.8 after res change to 5.2 a day later.
-I get why they would drop if the plants were directly introduced with the nutrients solution, but if it's just sitting in a reservoir, what would cause it to act like this?

I recalibrated both my pH pens and they Re reading the same, so that's not a problem.

System is a drain to waste and the waste is collected all into one container for easy removal.

Here are some pics of the system to visualize what I am talking about:
*note: lid is always kept on the reservoir*
a4b77a72b78559ecf2a5c50853d0e655.jpg

5fbb7ee11c32715143cd81419bcc98af.jpg
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Im no expert and I grow in COCO but I would use an old milk jug (add water of course) and add one nutrient in at a time, allow to sit for a few minutes and measure periodically. Hopefully this will give you an idea of which of the additives (GH or CALMAG) is causing the swing..
 
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