1. Syrine Filter. ( this usually suit for small quantity liquid or personnal users)
this is how it looks
A syringe filter (sometimes called a wheel filter if it has a wheel-like shape) is a single-use filter cartridge. It is attached to the end of a syringe for use.
the general process of filter is like this picture
but now let me introduce more detail to you
since the steroid is limited and a little worthwile (lol :), you’d better draw a small amount of air (about 1ml) into the syringe before filling with steroid solution. This air is used to purge the filter at the end ensuring the minimum sample is left in the filter.
Load the steroid solution into the syringe
Attach the filter securely with a twisting motion. With a luer slip syringe, this is about one quarter turn as the filter is pushed on. If the syringe has a luer lock (as in this example), fix it firmly but do not over-tighten.
Hold the assembled syringe and filter vertically to wet the membrane evenly. This prevents air blocks and promotes high flow rates as the liquid is spread evenly over the membrane surface. The actual physical design of the syringe filter will have a big bearing on the possible flow-rate through the filter.
Press the syringe plunger gently to push steroid through the filter. If possible, discard the first 0.25-0.5ml of sample because if there is any contamination present, it is likely to be higher in those first few microlitres of sample. If the back pressure ever increases significantly, change the filter as it may have plugged. Avoid pressing excessively as this could cause the filter housing to burst.
Push the air through the filter to purge the housing and memnrane and recover the maximum amount of steroid solution.
After all this done, the steroid is ready to injection now.