Spraying roof from the ground

What a simple solution is this....., spray a roof with moss with a biodegradable product, wait a moment, and fluss everything from the ground up, no scaffolding material or ladders required, so very safe, only using the Long Cast Nozzle ø 5 mm. on the video unti 48 ltr./min. - 160 bar (included lance adapter less than € 100,00)