Can I use the saline sachets for my grandson as he has a nebuliser. He is 5 years old.

Your son is old enough to use the sachets. Do you mean can he perform a sinus rinse. If so, he is able to perform sinus rinse. You can teach him how and it is best if he holds the bottle and performs himself, if possible. We also have a pediatric kit, which comes with a smaller bottle. It is available on our webstore.