We have alkalinity results of 4-8 ppm on most occasions our goal is to get it above 20 so a pool test kit does not cut it when trying to be this accurate. The margin for error is greater than the end result. We use a digitial titrator, your county extension servuce might be a good choice. For not much money they will test pH, hardness (many times same result as alk) and several parameters that mean nothing to a pond owner.

Greg Grimes
www.lakework.com