Hello, I would like to separate paramecia from smaller particles (max size 10µm) but keeping paramecia alive. Centrifugation or sieving could be options - what speed or mesh size ? - but may are there other ones...
commercial filter papers (e.g., with pore size of 20-25 micron or larger) used in laboartories, allowing to separate the smaller particles and to retain paramecia
See if they are positively phtotactic, in which case they are can segregated with the help an adequate source of artificial light & then scooped out from the rest of the contaminating particles.