Bis:
10days x 1ml x 2 heads x 2 arms = 40ml
10 days x 2ml x 2 heads x 2 arms = 80ml
10 days x 3ml x 2 heads x 2 arms = 120ml
6 weeks x 3ml x 2 heads x 2 arms = 72ml
TOTAL for bis = 312ml
Tris:
10days x 1ml x 3 heads x 2 arms = 60ml
10 days x 2ml x 3 heads x 2 arms = 120ml
10 days x 3ml x 3 heads x 2 arms = 180ml
6 weeks x 3ml x 3 heads x 2 arms = 108ml
TOTAL for tris = 468ml
TOTAL FOR BIS AND TRIS = 780ml (8 bottles).
This is doing it correctly. Also, it's if you need all 3 heads of the tris done. Most people don't need the horseshoe, so then the tri amounts are the same as the bi amounts, so for both you need 624ml (7 bottles)