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DIY glass hang-on filter

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I start it by putting siphon in the water so air go out. Then I close shorter  output with my thumb and so install it in the proper position. Filter must be filled with water. When I do waterchange the water level in the filter is never lower than the end of the pipe and I do not have to repeat this process, just add water.

Here is a similar system, only bigger and it is not hang-on





This tube is 8 cm wide and I have to shut it with a piece of the nylon bag.

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