Calcium

Also, if you do not water until run off, then there is a good chance there is salt build up at the bottom of the pot. Coco should be watered to run off if for no other reason than to flush out some of the salt build up.
@Proph
Water in tonight at 6.0 220ppm in 394ppm out. 10% runoff
 
@Proph
I got my runoff down to 6.77 from wherever it was.
Should I continue to water at 6.0 or 5.8 ? What PH runoff PH am I looking for?
 
Oh almost forgot. So last 4 waterins have been H2o in at 6.5, 6.3, 6.0, and today 5.8. Runoff today 6.7.
Last night's runoff PPM was only 390ish with A PPM in of 220ish. I'm in flower and would love to get that PPM up.
 
Builder, what the water pH and ppm going in? it's weird as hell that the coco is actually making the run-off more alkaline!
Feeds are lloking pretty mild, and run-off ppm are ok too,... coco wants lower ph than true soil, so keep inputs at 5.8-6.0, and double check your ph meter for accuracy if you haven't already....
 
Just calibrated the pen. Inputs are mild. Last input was below 400 and it was a tea. Base water 150PPM after dechlorination. Again PHing between 5.8 and 6.5 but last 4 or 5 waterings have been below 6.3.
 
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