Hi Saif, first I do not have experience with this product but a few things stand out, first is why is there a need to clean gills. What does that even mean?? If gill flukes are suspected (confirmed with a microscope) would it be better to use a product which specifically targets gill flukes? This sounds nice but sounds like snake oil "Preis Carely contains only natural sub*stances and there*fore will not harm aquatic plants, corals or inver*teb*rates.". My last concern is what is the active ingredient?
Another thing is it says to clean the intestinal tract. What does that mean and why would you need to do that??
Pat