Following this thread has intrigued me. I tested my pond water with a nice pool test kit over lunch today. Nice Sunny day 72F feels like 76F. Here's what I got:

Hardness - 0
PH - 6.6
Alkalinity - 40
From the link ewest provided I determined a 21.24 mg/l CO2

I have 2500lbs of ground gypsum coming to help clear my muddy water due to suspension in the water. Will I need to go get a couple bags of Ag Lime as well?