Just knowing how much pressure it holds, is it a heavy wall ? If so it should hold like 150psi. Which is good but not a lot. It’s enough. U just wana be careful when letting it get to hi pressure and don’t put so much ingredient In it. 1/8cup ammonia and 1/4 lye should be enough for a 1000ml flask,maybe 1/4 cup ammonia and 1/2 cup lye at most. And u just add heat or ice to it to change the rate of the reaction. No water. Just crush the ammonia. Make sure u have multiple lids for ur flask in case one flys off and breaks. Make sure no open flames. Give it time, work the reaction domy let the reaction work u. U want almost all the lithium to dissolve. That means u passed all the electron over. It is 1g lithium to 1g ephedrine. Since snb isn’t pure ephedrine the ratio is 1g lithium to 2g pseudoephedrine,because the sudo is actualy only about 50% ephedrine and other 50% is pill shit. Which is why snb is a more “dirty “ product. Cuz it is only 50% at best of not cleaned. But 50% is still very fair quality lol. I really recommend the soda stream if u are not sure about gauging pressure in a flask yet. It gives u an actual feel of the reaction. And it works just fine. Just need multiple caps incase they break.