KDSD
I am in the same situation as you. I have been told, in no uncertain terms, that under the ZNA rules, a pond builder is considered "professional". I've stopped fighting the issue even though I don't see the corolation between building ponds and having a personal collection of koi and wish to compete as an amateur. The bottom line is this: IF YOU SELL DRY PRODUCTS OR INSTALL PONDS, INCLUDING FILTERS AND OTHER EQUIPMENT, YOU ARE CONSIDERED BY ZNA RULES TO BE A PROFESSIONAL!!
If you would like to pm me to ask any further info, feel free to do so.
Mike Perret