General description Convenient for regular maintenance, the AlwaysH Aquarium Vacuum Cleaner features a sturdy one-way valve to improve suction and prevent splashing. This aquarium vacuum pump effectively filters gravel, vacuuming up food, fish waste, and toxins that accumulate over time. Safe for fish, the siphon kit includes an effective filter that prevents small fish and shrimp from being sucked up. Economical compared to other aquarium accessories, this product performs as well as more expensive vacuum cleaners.