Dilution for Elector PSP for insects on chicken

[Kirklasu]

My chicken has the tiniest insects in the fluffy parts near the shaft of her feathers. I have to really search to find them. She is not well so I need to treat her.
I’ve purchased a small quantity (5ml) of Elector PSP for £25 as I only have 7 chickens.
The little file has an instruction which by my calculation is too dilute.
The instruction is 1ml in 750mls water
Reading from the large green carton data sheet I should use 1.6mls in 750mls water for spraying onto the chicken for Northern fowl mites and almost 2ml with 750mls water for red mite
I have contacted supplier who says I shouldn’t need to use more than 1ml in 750mls but that it is safe at a higher concentration. He’s the only uk small quantity supplier and I have made my purchase but I want to apply this once and have the best chance of killing the insects
Please advise.
The liquid looks like a thick creamy/white liquid in the vile.
Many thanks

 

[casportpony]

Welcome to BYC. I think the amount you need to use is 1.8 ml per 750 ml.

Here in the US, the dilution is 9 ml per US gallon (3785 ml)
3785 ml / 9ml = ~0.0024 ml

0.0024 x 750 = 1.8ml

Double check my math.

 

[Kirklasu]

Welcome to BYC. I think the amount you need to use is 1.8 ml per 750 ml.

Here in the US, the dilution is 9 ml per US gallon (3785 ml)
3785 ml / 9ml = ~0.0024 ml

0.0024 x 750 = 1.8ml

Double check my math.

Thank you. That confirms my maths too. That what I used.