I bought this when it was a TSV before, as I really rate Wet & Forget. However, I wasn’t impressed with this version. It was more of faff than when I use the blue kind in a sprayer, so I went back to using that. The results with the Rapid also didn’t last as long, possibly because the application was sporadic - foam on some areas and liquid with no bubbles visible on the rest.
I treated the garden with the “normal” Wet & Forget in November and the algae was completely gone in 48 hours and I know I won’t need to redo it until the end of this year.