Pawl
What are they?
How do they work?
		
		
	 
 
The one’s I had  came in crystal form which expanded Mix them in with the compost prior to planting containers I only use them with hanging baskets and tubs which are a temporary planting.I don’t think they would of much use with more permanent planting in tubs.
Gro.sure was the brand I used Personally I would be reluctant to use soil due to introducing disease 
With my permanent containers I put a layer of well rotted garden compost in the bottom of containers and spread a layer of fine gravel on the surface of the compost It helps in retaining moisture 
Unfortunately I haven’t found a  way  other than daily watering.Once the compost has dried out over head watering just runs straight through.Ihave a grass in a pot which I some how overlooked an I had to put in bucket of water to soak the compost 
One alternative is to install on of the automatic watering systems.