Is there any significant difference between the G1 and G2 iongen other than looks? I have a 10,000 gal pond using two aquascape waterfall filters, an aquascape uv light and also a ultima II biological filter. Would the iongen create any problem for the biological filter? Thanks for the help.

Yes, the G2 is much improved. It’s easier to use and has many new features. Check out the product specs at Aquascapes.com