This is what I used to spread the granules around the edge of the pond. Worked pretty decent. Just pointed the direction of spread out towards the middle of the pond as I walked. Had wife drive along with 4 wheeler to refill me so did not have to walk back and forth to supply.
hand fertilizer spreader For the liquid I just used a 2 gallon hand pump up garden sprayer and diluted at 9-1 like the jug suggested for that method. Then sprayed the mats with the mixture. Drove the Polaris along side the pond while spraying out over the algae. Went pretty quick.
I sprayed the whole perimeter at once, but as a total amount compared to the total pond area it was only a fraction of the whole pond at one time. Hope it was not too much at once. I have aeration so that should help if the DO does try to drop.