Rust color on some top leaves

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General Hydroponics GH1514 pH Control Kit

The General Hydroponics GH1514 pH Control Kit contains a liquid pH test kit, pH Up solution, and pH Down solution. Nutrient pH solution should be slightly acidic, with the ideal pH for most crops being between 5.5 and 6.5. The GH1514 solutions allow gardeners to easily adjust the pH in their...
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Mad1operator said:
What if then is the more accurate way to make that determination
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You did use one of those analog pH probes didn't you? If you did your pH corrective flush may have made things worse.

I use the blue lab soil pH pen or the Apera PH60S (spear probe).

Amazon.com : Bluelab PENSOILPH pH Pen for Soil, Coco, Rockwool and Solution, Easy Calibration : Soil Testers : Garden & Outdoor

Amazon.com : Bluelab PENSOILPH pH Pen for Soil, Coco, Rockwool and Solution, Easy Calibration : Soil Testers : Garden & Outdoor
www.amazon.com
 
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