I ended up spinning it very fast which made a ton of difference, I could see all the crap pelleted at the bottom and a very nice clear solution on top which I collected and placed in a separate vial. It seems clean looking at it through the scope.
so you first centrifugated first and then filtered with the syringe filter Doron has suggested?
can you measure the mesh size of these filter tips for me and maybe post a link to them?
I have never had much contact to laboratory equipment and don't know what nice things are used there.
I always like recipes for microscopy material that is widely available. There remain so many special ingredients anyway and I have the impression that this difficult availability is often what keeps people from exploring new microscopy topics.
Here is a photo of the filter. They are sold in quantities, I only have a few. It is a polymeric membrane - nylon, polycarbonate or other (possibly Teflon as well, although I have never seen one), diameter of about 25mm. within a plastic fixture, with Luer (syringe) connectors on both sides. There are other sizes and variants. The polymer is a very uniform mesh, and hole diameter is most often 0.2 or 0.45 micrometers (there are other hole sizes). The mesh size is hence printed on the filter and package, as hole diameter. One popular application is sterilization, since they can filter off microbes from a liquid. Sold by all chemical/biochemical/biological lab suppliers.
I had thought that the issue posted by Wes could be solved with such membrane filter, but apparently the viscosity of his cellulosic solution was too high. So, a very high pressure on the syringe plunger. According to my experience, very high pressure might break through the filter and destroy it, so the filtrate is the same as the unfiltered solution. But it depends on the liquid in question. With cellulosic materials, the viscosity rises steeply with concentration.
A centrifuge in such a case is a very good idea.
I too prefer home-made and easily available over lab-supply chemicals and accessories, but sometimes there is no choice...