I gotta say after trying damn near every "flushing" product known to man......Flawless Finish from Advanced was amazing!
It actually cleaned out all the buildup inside the pvc pipes in a RDWC system. No other product I tried did this. It also made a noticeable difference in the final product.
I'm not a fan
Advanced Nutrients....... But they actually produced a really good product IMHO
Botanicare ClearEx tested the worse as it did absolutely nothing!
Flora Clean was another one that worked ok, but you have to use alot of product and its labor intensive..... Might as well just use water if you have to flood and drain 100 times!!
Just stating my experience with said products..