Canna Coco, and though it is pre buffered, I buffer it anyway. Run two to three gallons of RO (100 to 110 ppm) w/ 2 ml CaliMagic and 0.5 gram Epsom per 2 gallon smart pots.
I have used straight coco for years but this grow I have gone with 70/30, coco/Perlite. Thinking I am liking the change.
I also run Canna A&B, Cannazym, Rhizotonic, Bloom, and either KoolBloom or PK 13/14, and Drip Clean for the win.
Remember Less is More!
Been running 30 to 40% recommended by Canna, if it calls for 10 ml/gal I add 3 to 4 ml, goal is to get 200 to 250 ppm in veg and 300 to 350 in flower of A&B.
Now remember that coco is a Cal/Mag hog, full rates of A&B give you the needed Cal/Mag but at the lower rates of A&B you need to supplement with extra C/M. With the RO water, mine adds back in some Cal/Mag for flavor which gives me approx 105 pm, so I add 2 ml/0.5 grams C/M per gal.
Here is my spreadsheet to give you an idea of how the numbers work. A&B for this run was about 260 ppm so I upped A&B about 0.75 giving me 334 ppm.
View attachment 4398819
Doing the math, if I ran full rate A&B, it would be around 550 ppm so I would not need extra Cal/Mag but since I run light nutes the total including the .the extra Cal/Mag is around 570 ppm.
Hope this make some sense to you!
GR