Thank you all for the information. I have been traveling with my son this week so I have continued my research. Bill C yes I am looking on eBay. I like most want a good system and a reputable pump but looking to save a few bucks. Vertex has such a great reputation I'm going with their diffusers but hope sourcing the pump and other parts I would end up with a great system and at a value. Again thanks for the warnings and other good info.
Thanks
Dave

Thanks
Dave
1 acre pond.