depending on the type purchased their a good investment
the one i use is directly injected into the nutrient
oxygenating it as well as steralizing it it then goes through the fogger to the root chamber doing its job there
you can find it at
http://www.blackmaxozone.com.au retail $459AU
youll need to ring to contact a local distributer
also the fogger im using isnt readily available as its a sample model used by a company to design humidification and propagation cabnets ,but i think there is one left as there not advertised around $240AU delivered
solar power sounds interesting for running the fans and pumps wouldnt the light overload the batteries?