I Have not tried the Hanna unit but it is on my wish list .
Quick update: I did 14 days of 2.3ppm of copper power and then did a 16 day of 1.8ppm of copper power in the 75 gallon QT. And then I used a new net to transfer the fish to a 40qt until the DT is fishless for 90 days
Ooh I was always under the impression that some eggs might last longer than 14 days so I got nervous
Ich tomonts can last up to 72 days (according to one study), but by transferring the fish away from the danger they cannot be reinfected by the free swimmers those tomonts release. However, it is absolutely imperative for the copper level to remain at full therapeutic for the entire time during this 14 day treatment period. You even transfer the fish from full therapeutic copper into another (non-medicated) QT at least 10 feet away. Reuse nothing from QT1 for QT2.