my house is 60 sqm,anyone know how many litre  Premise 200 is enough?

double story house,

2  PCV pipes was installed at ground level.

Sounds like you just want to saturate the sub floor which already has the pipes installed.

 

If you just think about how much you would use in 1m2 and I would say 1 litre is sufficient then go an check the dilution rates on the product.

 

So you check a 1 litre can of pesticide and it says dilute 30 times so you have 30 litres then that would cover half your house.

 

On that basis you would go for 2 litres.........but I think the sub floor pipes will already be spraying out  the first 5 metres before liquid gets 100m down the line so double up on your quantity to be sure it gets all the way around.

 

When my sub floor was drenched (about 50m2) it appeared they filled a 40 gallon drum (150 litres) and just emptied it (3 litres/m2)

 

just goes to show, you think 1 litre/m2 and its probably nearer 3 litres/m2