Brock, syringe filters

Ok Brock, you always speak of using 0.22-u syringe filters. #1 where can I get these? I know you can’t list a web address, but how about a name? It can’t be illegal to buy or possess. #2 How do you use them? Any prep ahead of time or things we should do or not do? #3 If you had a choice would you use Ttokkyo deca, the aussie stuff (forgot the name) or is there still a legit american made 200mg/ml deca available?