Add clean water to the seed mixture and stir. Viable seeds sink to the bottom and nonviable seeds float. Remove floating seeds and then pour the good seeds into a fine mesh sieve.
Rinse the good seeds repeatedly until they are clean and no pulp remains.
Spread the clean seeds onto a paper plate or coffee filter to dry for three to five days. Stir twice daily to promote even drying. Store dry seeds in small manila envelopes.
Don't forget to label with the variety and date.
Keep reading: 10 Tips for Storing Seeds