Hope this helps - This summer I will be posting a step by step installation of a DIY direct solar pumping design that I have been using for a while now. I will explain/show where I buy the components and how to assemble them. If a person is somewhat handy it can be built for around $750. (excluding diffuser assembly(s), manifold if 2 diffusers are to be run, and air line(s).
The system:
1) Direct pumping, no batteries, only day time running
2) 8' or less max pond depth, 12V diaphragm pump
2) 7.5 hrs minimum run time during MN summer, 1.2 max CFM
3) 4 hrs minimum run time during MN winter, 1.2 max CFM
