Yes I have used 1 dose, which for 4400 gallons is 3/4 cup, and I have also added equal part (3/4 cup) Borax at same time the last 2 nights. My wife picked up a salt stick test kit today also. Tested that and it came up around 5.4 reading which on this test kit equals 1960ppm.

I understand that the CYA will take a little while to up itself with this being a fresh fill only 2 days ago.