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@MeaCulpa, 2.8 sounds about right. The flower nutrient mix ranges from 1400 to 1600, and I run a pH between 5.9 and 6.1.
Once in flower, I don't change the water; I top up the reservoir.
I have a few 35-ltr mixing buckets, and I will adjust them according to the reservoir's pH and TDS.
When I started DWC, I changed the nutrient mix every week, which became expensive, only to be told not to bother if I used CANNA Aqua.
Good luck with your grow; I see you also have a mix pack on the go.