| Since nobody is comfortable responding, I'll just share a few thoughts. First, Nexus is proven equipment in hobbyists' ponds. Bakki Showers are undergoing their first year of real use by hobbyists in outdoor ponds. Second, check out the Nexus operation/maintenance manual. You'll find it at several sites on the web. If your source does not have it posted, check Keirin Koi site.
As a not mechanically astute individual (I sometimes remember how to use a can opener), I think it important that the person I'm buying from is convenient to communicate with and willing to help, whether by phone or otherwise. So, you might try asking for advice first. If not helpful before they have your money, I'd guess they'll be less helpful after they have it. But, then, I do not have high expectations, and thus am seldom disappointed and occasionally surprised by how good-hearted some people are. |