good morning, im looking to clean k-rend on a couple of ,houses , my question is ,i own couple water fed poles ,first question is what size ltrs per minute 12 volt water pump do i need pressure wise to reach gable ends and such, second question, i would like to remove brush at end of pole and fit nozzle suitable to work alongside 12 volt pump thus getting the cleaning product to hard to reach places.all in all, remove brush and fit sprayer type nozzle to pole help please. thankyou for your time.