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Re: [APD] Solenoids & Needle Valves

I would recommend a needle valve for any compressed gas
set-up where you don't want the flow to exceed a certain
for whatever reason, such as, killing all your fish.

A solenoid is optional. You can run without one and you'll
use up CO2 more quickly than if you had a solenoid
connected to the lights timer. If you can find inexpensive
but reliable solenoids, the savings in CO2 can offset the
cost of the solenoid over time. With a solenoid on a timer
but no controller, you rely on relatively stable pressure
and the needle valve to maintain your CO2 levels ()which,
of course will dip at night when the solenoid is off, but
be relatviely stable oduring lights-on. With no solenoid,
you rely on the neeedle valve setting and the pH goes up a
bit at night and declines during the day.

A controller is the most expensive and least useful, though
some of us will use them on a tank or two if for no other
reason than to see what happens ;-) .

With any of these methods, the pH swing needn't be more
than about 0.2 units, which is an insiginificant amount for
most aquaria. It doesn't hurt the fish or plants forthe CO2
to run 24-7; it doesn't hurt for the CO2 to turn off at
night; it doesn't hurt for the CO2 to go off an on several
times as the controller trip points are it.

So it's really a question of your own convenience and up
front versus long costs.

have plants, have fun,

--- urville <urville at peoplepc_com> wrote:

> I notice alot of Co2 systems dont come with a needle
> valve. And i mean even when they are called complete
> deluxe systems. Why is this? Are they not as important as
> I had been led to believe? And wil any needle valve do? I
> see alot of different kinds some for different gases.
> Last but not least. is there a definitve answer as to
> whether you need a solenoid. I see that ph controllers
> are optional. and in my tank with a constant bubble rate
> I cant ever see needing one, but the solenoid issue, I
> cant seem to find an argument for or against them that
> gives any real world proof either way.
> Anyone, Anyone? Bueller, Bueller, Bueller.
> hehe sorry
> Ian
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