Unboxing a DIY algae scraper, scraping and sucking out the algae at the same time, no algae remained

This algae scraper can absorb water and suck away the scraped algae while scraping the tank wall, which is great! !
I bought it from a workshop of the youtuber "水世界水族馆", it works very well and can be used with accessories to adjust the water flow, I don't have the accessory in the video and my tank is too small, so the water level goes down very quickly, but The effect is very obvious. If i can adjust the water flow(in small tank), or use it in my bigger fishtank, that will be super smooth. This is a very practical invention, great! !