Deletion of First flush device

Comment: to First flush. A really quick Google Scholar shows at least mention of https://scholar.google.com/scholar?q=%22First+flush+device%22 first flush devices, but I'm not seeing a lot of detail in what I've seen to warrant a full article. The article appears pretty essay or -like, but I could see the search term being used. If there is a stray source or two out there really establishing notability, I don't really expect much more than a stub article from what I've seen
Stance: merge
Cited policy: Wikipedia:What Wikipedia is not (WP:NOTHOWTO)