Runoff with soil and chemical vs organic nutrients

[vapoholic]

Hi,

I am a bit unsure on this, but if you're using chemical nutes, are you still encouraged to do a ~20% runoff as with Coco for example?

With this in mind, if I use organic nutes like the Canna line, do I need any runoff at all except for a) just a little to know if I have watered enough and b) to check pH if something seems wrong?

Thanks.