I used it because the EC of my tap water is 0.7, and HESI has a lower EC compared to other coco fertilizers since their nitrogen is organic (it's basically urine).
So, I used it, and it's okay. However, I prefer Canna much more; it offers better control and a much faster response from the plants.
That's why I grow in coco!
But HESI is really fine; there's nothing I can complain about.
However, their feeding schedule is honestly BS. 15ml of PK 13/14? I only put a maximum of 5ml per liter, and that was more than enough.
Don't use the full 5.0ml of Coco HES eitherI; instead, use 2.5ml - 3.0ml.
If you don't use Sanlight, water the plants on the outside with 2.0ml of HESI Coco.