Old Scales
Aquarium Advice Addict
From when I ordered my system from GLA I saw where the main difference between the choice and the next level up was the needle valve. The choice has a 12 turns from full closed to full open and the premium's is 20 turns. I was told by several experienced CO2 users that the needle valve was the best part to spend extra money on. They were right. My system stays dead on each daily cycle as far as bubble count. I'm glad I went with the GLA system now, but MAN it was hard to spend that much for a CO2 set up. lol OS.