When I last used a canesten pessary about a month ago, I didn’t have any chalky residue either. Kept looking but none appeared. When I used the first pessary, I had a lot of chalky residue. Like suzysunday, I presumed the Pissarro had been absorbed. Now on 3 months (1 per week) Fluconazole tablets. Can’t seem to shift the thrush, think it’s embedded. Just awaiting the results of another swab taken to the doctors last Tuesday. Hope you get relief from your thrush very soon. Take care.