Well, Google "filtered grape seed oil" and purchase a small quantity.
Google, "millipore sterile PVDF 33 millimeter filter" and purchase a few.
Purchase syringes equal to the amount you want to filter ie: purchase 10 ml syringes if you want to filter 10 ml of test.
Purchase sterile vials equal to approx 1.5x the amount of test you want to filter ie: 15 ml vials if you have 10 ml of test.
Purchase 18 ga needles.
Take delivery of everything, draw up 10 ml of test into 10 ml syringe using 18 ga needle. Needle off, filter on, needle on. Filter into 15 ml sterile vial. Discard filter and needle.
Draw 5 ml of filtered GSO into syringe same as above. Needle off, filter on, needle on. Filter into the 15 ml vial that holds the test.
You now have test that has been filtered and cut. The potency has been reduced to 67mgs/ml (assuming typical prop dosage of 100mg/ml.