Why did you get the the bad salty coco again lol.
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...I just find it hard to believe I'm experiencing a Mg defficiency seeing as my tap comes out around 300ish ppm/.6 EC @ .5 conversion.
I hope you do not have root aphids as it will make you chase the phantom mag deficiency. the ra's are very difficult to see but it may be worth checking w/a scope.
40amps did a thread a few yrs ago battling RA's and I believe the ogbiowar works on them to.
good luck
peace
That's why I've been saying "@ .5 conversion" because my pen operates at a .5 conversion.
The three most widely used scales are .5 .64 and .7
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Let me set ya straight on a few things before you end up hating coco. First Gh coco bricks/blocks are salty as fuck! I love how course it is, but damn that shit is always salty. Canna and botanicare have an excellent rep for being washed, buffered, and ready to transplant into straight out of the bag (personally I prefer to wash everything so I know exactly what's in it. Eliminates salt content as a potential issue if something goes wrong). Second thing, PH is extremely important in coco (keep it between 5.5-6.0 at all times. This means readjusting the solution after 24 hours if it raises above a PH of 6). No reason you can't use the drops (I use them to confirm the accuracy of my pens), but if you don't know what ph lockout looks like a pen will make life easier. Third you almost never want to give coco straight water other than during the flush period before harvest (this has to do with it's Cation exchange capacity). If you have an imbalance it's better to just pour full strength 6/9 run to waste until things are back in balance. Last thing, lucas is a terrible recipe to use with coco. Stick to just 6/9 with the proper ph
Oh and use full strength 6/9 with every watering from day 1 of veg until flush (for clones and seedlings). IF you experience burn just mix your 6/9 slightly weaker (i.e mix 4 gal. worth of 6/9 in 5 gal. of water) and continue feeding. To fix the plants you have now, I'd start by slowly pouring 5 gal. of half strength 6/9 through each pot, allowing the excess to run to waste (in the tub would make that easy ). Once they have drained throughly, add another 1/2 gal of full strength 6/9. This will wash out the excess salts while preserving the CEC of the coco. You should see improvements within 2-3 days.