I'm still confused. Not about whether to add the water or reagent first but as to how much of each.

The first line on the bottle says "pool water fill line". That would mean add 15ml of pool water first.

The second line says "CYA reagent fill line". That would mean add 30ml of reagent.

Is this correct? The instructions on the test kit lid says "add 15ml of CYA Reagent ..." then fill to top with pool water".

One method is 1/3 water. The other way is 1/3 reagent. Which is it?

Sorry if I'm dense on this - I want to make sure I understand correctly.
Thanks