I thought I bought a Duncan but now I am not thinking so. I have had it for about 6 months and it's doing well but just doesn't look like Duncan's I see in pictures. Any help is appreciated.
I finally got it figured out. I was using a salifert phos test kit. best I could tell I was around zero to maybe .02. I got a hanna phos checker only to realize I was actually at something like 2.3. Ran some GFO and everything is nice and happy again. I cant recommend a hanna checker for phos enough!