Aerating with solid tines will allow oxygen into the rootzone while allowing the release of carbon dioxide simultaneously (gaseous exchange). The three-inch long tines will punch holes into the soil which will also allow water and fertiliser penetration. This should be done at least annually, usually alongside scarification.
Solid tining will not relieve compaction, this will require hollow tines. Chisel tines can be used in the Spring to root prune, this will promote healthy new root growth.
Please contact me if you would like additional information about lawn aerating in Wells, Somerset.