prefilled syringes

Hi everyone. Noticed on this forum some talk in the archives about prefilled syringes. Well, it has been something I have been doing for numerous years at times without realizing it was wrong. Below you can see a picture of a syringe filled with cypionate about two weeks ago, now showing great...

I have been injecting daily (propionate) for some time now using 31 gauge .3cc 5/16 insulin syringes. I want to start preparing a week's worth of prefilled insulin syringes at one time for sake of convenience. My main concern is how to keep the process sterile. I am assuming that backfilling...