I was disappointed to see all the negative reviews on this item. Getting started is relatively easy. Three tips: 1. The piston should be below the water level in the gravel vacuum. This is necessary for gravity to allow the water to flow. This was difficult for my setup, which consists of two tanks on a stand - the bottom one is just a few inches off the ground. Do your best to remove air from the gravel cleaner. I do this by lowering it parallel to the bottom into the aquarium with the open end slightly up.3. While squeezing the siphon, place your thumb on the open end of the siphon. This creates a better seal than the inner sphere. It's still tricky to get it working when your tank is near the ground, but it's an easy device to use.
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