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Re: [APD] Re: siphon saga -- or - Missing connections
--- Steve Pushak <teban at powersonic_bc.ca> wrote:
> . . . There was a good idea mentioned in the thread
> where you
> connect a bleed
> line to the top of the U siphon and run this into the
> venturi of a power
> head. Thinking about possible failure modes, if the bleed
> line were to
> become disconnected, the siphon would be lost.
And if your water any of the the other plumbing becomes
disconnected, you generally have equally serious problems.
Moral: Understand that plumbing, just like web credit card
purchaes, relies on secure connections. ;-)
> The power
> head venturi
> must be below the water surface in case of power failures
> or the same
> thing would occur.
No. This has missed the point. The point of the venturi is
not to keep the siphon from tube from losing siphon during
a power shutdown but to restore a siphon whenever the sump
pump and the venturi powerhead are turned on *and* to
remove any bubbles that collect at other times. The venturi
can be above or below water and it will perform that
However, there is a reason to have the venturi under water,
at least in a CO2 injected tank -- to avoid the air-water
turbulence that would cause a lot of CO2 to be shed.
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