There are various opinions Jem. There are several threads if you search that discuss the merits of other heat sinks such as sand, saucers, steel discs vs a water pan with water and a dry water pan. Search "heat sinks" and you will see what I mean. That should keep you busy reading for awhile. Experience will aid you in determining what works best for you. Personally I like a water pan with water for ribs otherwise I really don't use water. I use a heavy metal plate. I did use clay but broke them from the thermal shock. Everybody on this site will have an opinion of what they like best or their opinion can be as simple as avoiding the cleanup with a water pan.