A lot depends on the exact composition. Are these all components of the mixture?

Plus low amounts of borax pentahydrate (aq) added to this industrial waste dust (Na2SO4 with impurities). It became like a suspension.

Here is the chemical reactions for generation of this industrial waste dust:

2 NaHCO3 + chaleur → Na2CO3 + CO2 + H2O
2 NaHCO3 + SO2 + 1/2 O2 → Na2SO4 + H2O + 2 CO2
NaHCO3 + HCl → NaCl + H2O + CO2
NaHCO3 + HF → NaF + H2O + CO2

A lot depends on the exact composition. Are these all components of the mixture?

Check MSDS for each salt present, choose the worst case to design your procedures.

Hi bro,
I knew this video 3 weeks ago.
I am very interested in this project. I am trying to find all documents related to make forever roses and I have a lab to make it, i am on the way to find forever rose 
I think that you need to add Banking Soda in step 2 (active  nonionic surfactant), replace food color by fabric dye color. It will be better for your flowers. let's try and let me know the result, bro!
I have some documents, it may helpful for you.
Regards,
Zimmy (Ms)

https://patents.google.com/patent/CN109380215A/en
https://patents.google.com/patent/KR20080020034A/en
https://patents.google.com/patent/KR100851211B1/en

@metallurgy Nothing will happen, but solution (water) could be harmful if drinked by somebody (large doses of sodium fluoride are harmful).

And what do you expect?

You combine mixture of solid salts with water. What is the most likely outcome?