[APD] Solenoids & Needle Valves

[urville <urville at peoplepc_com>]

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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