Review on 🐠 VavoPaw Black 5 in 1 Fish Tank Cleaner | Quick Water Changer & Aquarium Cleaning Accessories | Siphon Vacuum Gravel Cleaner Kit with Air-Pressing Button, Glass Scraper, and Water Flow Controller by John Larsen

Along with water, the suction tube fills with gravel in less than 60 seconds. By raising the pipe well above the gravel, water seeps through the system. But it's impossible to place a bathtub on or near gravel unless it immediately collides with rocks. Maybe I'm doing something wrong, but the product didn't come with any instructions other than those on the box; and it was just for assembly.