There is an advert on here that keeps coming up for pure rain sprinklers. It claims to increase growth by delivering more oxygen to the plant. Apart from the fact that plants use carbon dioxide to photosynthesise their food, and produce oxygen for us to breathe, I cannot see how this sprinkler is any different from any other sprinkler such as hozelock.
Any fine stream of water will pick up more dissolved oxygen in it.
Their is no oxygen cylinder attached to it. Maybe the manufacturers could enlighten us. There appears to be no info on how it does this on their web site.