1.

Which measurement system are you using?
US   Metric
2.
Do you know what size backreamer you will be using or would you like a recommendation?
Recommend
Know:   
3.
How many conduits are you pulling back?
4.
What is the size of conduits you are pulling back?
5.
What is the bore length?
6.
What type of soil are you drilling in?
7.
What HDD system will you be using?


(Pump rating per minute)
8.
What is the estimated fluid viscosity?
(How to measure viscosity)


9.

What length of pipe are you using?
10.
What size of bit will you be using for the pilot bore?
  

Please Note:
These are general mixing instructions for different soil conditions as provided by Baroid at www.baroididp.com. These mixture rates are only starting points and adjustments may need to be made to get the proper results.
Baroid

It is important to note that pulling back faster than the recommended " time per pipe " does not allow adequate drilling fluid flow and mixing to occur during the backreaming process.