Intruder, The label on the bottle says that each tablet contains 325 mg of Acetylsalicylic acid. This is the ordinary aspirin size in Canada.
Thank you Shirley for your response, here in Belgium we have 100 mgr and 500 mgr ASA per tablet. Me also, next year, I will test the effect ASA addition on Miltonias (Pensy orchids) and Masdevallias. They are orchids very sensitive to all kinds of diseases.