Hi OrkyBetta
Starting a gravel vac is easy once you get the hang of it, but a little confusing to figure out at first. It just takes some practice,
The idea behind using a siphon is that water will always run downhill, so you always want to keep your bucket lower than the tank.
What I suggest you do is fill up your kitchen sink with water and put a bucket on the floor in front of it. Take as much time as you need fooling around it until you see exactly what has to happen to get the water flowing through it freely.
First put the small end of the hose into the bucket. Then, with the larger end, scoop up as much water as you can. Raise the big end and watch how the water flows faster the higher you raise it and slower as you lower it.
Now, scoop up water and raise the big end to let it start flowing down, but once you see it come through the hose and start downward, immediately put the big end back under the water. Ideally, this should be at about the time it almost runs out of the wide section. If your timing is right, the water rushing in will catch up with the water in the hose and it will all continue to flow down into the bucket. It will work better if, when you put it back under water, you hold it with the opening facing up. If you don't lift it too high, it will flow a little slower and it will be easier to get it back underwater before it is too late. This is the whole thing. It will take practice, but once you have got it to work, it will do the same thing in your tank.
If you want it to have more suction, lower the bucket; if you want it to flow more slowly, raise it. To make it stop, just take the big end out of the water and let what is already in the hose flow through.
BTW, I'm not familiar with the particular brand you have, but some are fancier than others. If yours is anything more than a hose with a plastic tube on one end of it, make sure that there are no gadgets that are closed that should be open to allow the water to flow through.
Once you have the siphon action going, experiment with pressing the big end down into the gravel. A good way to pull up the dirt is to press it down until dirt starts to come up, then lift it and press it in at a spot next to where you were working. Once you get used to it you can try moving the gravel sideways a bit.
Good luck and please let me know how it works out for you.
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