reusing LIGHT MIX soil for big scrog plants / indoor grow

on my vegging plants. Witch are in 5 gallon pots.I was thinking of putting 2 scrog plants in 20 gal pot each and have used soil rooted up i was thinking of flushing and taking dead roots out and have heard that CANNAZYM WHICH DISSOLVES DEAD ROOTS am i right that it will be ok for the other plants if i do what i say.its plagron light mix soil

I am far from an expert, but my personal opinion is, why use soil that has had all the natural nutrients used up?
I know it saves money, especially with 20 gallons but wont you more than make up for the expense in the end?

Hey, well i reuse my biobizz allmix, as you can recharge the soil. Also i am currently experimenting with cannazym, did a wee test, through roots in a jar with cannazym and waited, it did not complete dissolve the roots but it did seem trim them back. I will show you cannazym in soil when i take the pictures of it, when i finish the test, but hell its not a bad idea, also i grow my veg in my old used soil, and if you are worried about if all the nutes are used up just add new soil as a mulch ontop of the old, and why not save money. Also technically you wouldnt have to worry as you can just add ferts,,,
I havnt used plagron light mix but im sure it would be simliar to other soils.
from what i can de-juice cannazym dose work,not as well as they say it dose, haha, but what dose?..
Just make sure there arnt any bad things in your soil, if i remeber you can bake it on low and kill bad bacteria while not killing all the good bacteria, but i wouldnt be able to say temps and times as i havnt done it.

starting to rant now so goodluck and take it easy