If you use one of these fecal vials first make sure that the green part is snapped all the way down inside the holder. Pour the strained fluid into the vial until it is almost full. Using your eyedropper continue filling the vial, drop by drop, until there is a slight bulge of fluid above the top of the vial.
Gently set the cover slip straight down on the top of the vial. Some of the liquid will leak out around the edge.
Wait about 15 to 20 minutes. It takes time for the microscopic eggs to travel the long distance to the top of the fluid. They will stick to the cover slip when they get to the top. Don't wait too long because the salt solution will begin to dry which will distort your eggs.
When the time is up, lift the cover slip straight up and set it on a glass microscope slide. Give the cover slip a very gentle tap with your finger nail, which will squish out excess fluid. Now you are ready to see if you have any parasite eggs in your sample.
Next Using the microscope.