Thanks
@purpleinopp. Yes their guidance specifies the number of pellet cones (they come in groups) to insert into the soil depending on the diameter of the pot. Normally I put a bit less than they recommend since in the past I've noticed white residue form on the clay pots and sometimes on the soil itself,
which I assume is excess salts. The soil mix I buy is made by the same producer which means there are some pellets already inside the bag.
Good point about the brown water. I would say that the soil has 'regular soil odor' though I wouldn't go as far as saying it smells like soil outdoors. It can be a bit musky sometimes. I will keep your flushing suggestion in mind. Some dust has gathered on the leaves so it's about time to have a little shower.