Hello,sorry i can only post here,i want to do an mhrb extractiion but instead of pure naoh i bought a mix of NaOh<70%,NaCl>30%,sodium carbonate>0.2% will this work too with an stb tek?

This sounds like it should work, given that sodium carbonate can be used to convert fumarate/acetate to freebase, and that NaCl is the recommended measure against eulsions in STBs.

It'll work, you will have to adjust the amount if it's only 70% NaOH. I would be concerned about perfumes or weird surfactants if it's a drain cleaner product. Personally I'd look for some pure NaOH.

There's no rush, there is never an urgent need for DMT so, maybe slow down?

There is no perfumes or other agents in it,i already set up a 50/50g,700 ml h20 jar,i will do naphta pulls tomorow i am verry curious about the end result,i heard about salt teks before but never tried it,thanks for the help guys!