Yes you can use a bucket and scrub brush to put the percarb on as well. I would go with the pump up, unless it's a huge deck it won't be too bad. Try to work in the shade and it won't dry out so quick. When you mix your percarb, do it in a 5 gallon bucket stir well and wait 10-15 minutes for it to settle down before pouring it into the pump up sprayer. If you pour in the sprayer right away it could over pressurize the sprayer and burst.