The vials can get worn out. Lots of scratches on the vials can make readings be too high.
I would not worry about the unit itself though. I have not heard of that going bad.
This is a pre-treatment before using flatworm exit. You add the H202 and then many of the worms float in the water column where you can net them out of the system.
It prevents you from killing as many in the system with flatworm exit because dead worms release a toxin you then have to deal with.
I would try adding Brightwell Neonitro to raise nitrates.
You might consider trying ATI Essentials Pro or B-ionic for Alk, Ca and Mag. Those products are easier to use in my experience.
Glad you are enjoying the Goni!
Hi All,
Regrettably, our meeting and venue plans for the end of this month (Feb) fell through.
However, we are working on plans for our next meeting to be March 16th. Stay tuned!
Andy