i have a clear plastic tube 35-40mm taken from a gravel syphon. To the bottom of this tube this i attach a new white cotton sports sock:yes
ossably need a elastic band to hold in place if you have big feet:lol:have it so the sock is slack and the toe part goes upinside the tube
to the top of this tube i have a small power head taken from a old internal filter Lucky for me its a snug fit on the top of the tube.
before removing this from the tank place a tub/jam jar inder the pipe as crud/mud will fall back into the tank.
I have a 200 litre hour vac with no water loss:woohoo:
its a good diy project and with a little effort anyone can make something simlar.
first time i had the sock after powerhead but it clogged to fast!
Rob.