They are pretty good but you need quite a powerful airpump to drive it to get a good flow going. I have a filter output aimed at the side of the trap aswell as the internal spray bar thats run by the airpump so the flow is pretty good.
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Oh aye, I'm happy with it. I did order 2 tho so I could modify one...which I did. The fittings arent the tightest on the air chamber bit so you loose a bit of the oomph....but a little silicon does the trick.
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