Okay.....what can I say..... it is the definition that sometimes the simplest is also the most effective. I have been using it for a long time without any problems. Before, I was using all those battery-operated ones which suddenly had issues and stopped working. It didn't matter even if I took out the batteries. Everything had an expiration date. This one is the most effective. You place the end of the vacuum at the bottom, parallel to the surface of the water in the aquarium and with a slight upward tilt, meaning the nozzle should be facing the ceiling, and you quickly squeeze the other end with the bulb several times. The water will immediately start flowing vigorously. I highly recommend this product!

For the money, it's very good... better than I expected... I've used it over 10 times and it hasn't broken at all...

Very good, worth every penny, I use it for my aquarium and it has been a lifesaver! I highly recommend it without reservation!

It broke from the first use.
The first time I used it, the rubber tore near the point where the manual pump is.

Very helpful in cleaning the aquarium and the fish and turtles. It has solved our hands.

The product is great both in terms of usage and price. It doesn't need anything more. I have a 100-liter aquarium and I easily do my job with the pump and a bucket. Wherever you send the water (which is perfect for watering plants), it should be below the surface of the aquarium. At the bottom of the hand pump, which you use to clean the bottom, there is a mesh that doesn't allow the gravel to pass through the tube, so only the impurities go away with the water.