Overall this is a good diffuser, especially when combined with a full Ista CO2 system. It would give 5 stars but the ceramic diffuser plate seal must be _absolutely_ tight for the plate to function properly. After unpacking I only got big blisters. I completely disassembled the diffuser, reinstalled the diffuser plate, made sure it was fully seated before putting the bottom clamp ring on, then hand tightened as tight as I could without breaking anything (like the tab, holding the suction cup). Once I reconnected it to the CO2 distribution system, the reward was a very thin line of CO2 bubbles. So save yourself some frustration and reinstall and tighten your diffuser before attempting installation. Even at a rate of 1 bubble every 2 or 3 seconds, this diffuser works well.
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