I'll start it off with the filtering method I post over and offer since it really is great since microns are not practical for most users and this is free and very effective, and most people agree IVing is the only way to get a lot out of hydromorphone.
This filtering technique is free, quick, easy and is for the 99% of people who are going to shoot pills without a micron in this case hydromorphone). It really works at least 50 times better than just sucking up through a cotton ball or nothing.
Start by getting the supplies you need: a new syringe, preferably 1ml or 3ml, a cotton ball or other cotton source, a paperclip, and a mixing cap. Wash your hands thoroughly and get started. First uou can remove the needle but that is optional/preference. Most people will have 1ml and 1/2ml syringes lying around, go for the bigger ones, I have found 3ml to be the ideal size for extremely efficient filtering but 1/2cc works well too if that's the largest you have. Now take the cotton ball and cut some strips that can be doubled up and inserted into the barrel of the syringe with a paper clip, you can use any cotton, using one or two pieces form a cotton ball is just a little easier than 15 from q-tips. Pack the cotton down firmly with the plunger to the 30-40 unit line on a 1cc or 1/2cc syringe or .5ml on a 3ml.
Here is a little side step for pre-filtering pills with a lot of gunk and it is also good for very effectively quick filtering pills that don't need much of any filtering (suboxone) or just street drugs. Sterilize an old syringe and remove the needle. Mix up the solution and drop a cotton ball in, press the needless syringe straight down on it creating a firm seal and draw back. It should be pretty well filtered, many times just this is enough.
Anyway whether you prefilter or not, for the best possible filtration with spare supplies you already have just back load the solution to be filtered into the barrel full of cotton, insert the plunger and push through. The result is extremely translucent and well filtered and the best of any home method I have seen, it doesn't compare to anything except for a micron. nothing really gets stuck in the cotton in the barrel either, just remove the plunger and push it down again and the air will force everything remaining out. i generally filter it directly into the barrel of the syringe I'll be shooting with. You can try filtering multiple times with multiple filters like this if you're really paranoid but I have found one done right is great.
) are only any use for plugging, in my opinion. Horrid, messy, stabby things. 1ml ftw 
![:\](https://bluelight.org/xf/BL_Images/Orig_Emoji/wrygrin.gif "wry grin :\")
