I bought a mixed disa uniflora flask a few days ago which I deflaksed today.
Step 1: open the flask and pour a cm of rain/RO water into the flask.
Step 2: after a week prepair your deflasking/planting.
Step 3: use a clean pot, and ad a coffee filter at the bottom so that the silica sand does not filter out.
Step 4: pour boiling water over to kill all bacteria and flush the dirt out.
Step 5: then pour cold rain or RO water over to cool it down, and flush it once more.
Step 6: gently remove your seedlings and put them into a flat sourcer filled with rain or RO water.
Step 7: gently rince of all the agar and cut of all dead leaves and roots.
Step 8: pot them up in the sand about 2 cm apart.
Step 9: add a sourcer to the bottom, and add rain or RO water.
Put in a semi sun position.
That's how I deflaksed my disas.