Recycle Super Soil
Recycling Super soil is relatively easy to do and saves you money. After your season of growing is over, remove root ball and any remnants in soil. Purchase a Mixasoil Re-Amend Kit and then add worm castings, or purchase a Mixasoil Re-Amend Kit with worm castings added. Either way just add the kit, mix, water, and turn occasionally — and in two to four weeks you will be ready to Plant!
You will definitely save money if you reuse your soil, but you will also put in more labor than you would have if you just used new soil each harvest.
The microbial life within it makes it easy to use again with a little maintenance.
The best option is to get a soil test so you can determine what nutrients are present so you can add only what the soil needs and prevent excesses or deficiencies