This amazing diffuser. I left it in my aquarium for a full 24 hours before hooking it up to CO2. Thousands of tiny globules flow out of it as it works. I have tried several other diffusers but this one creates the smallest bubbles in the largest volume that I have personally used. I personally find the initial soak absolutely necessary, although 24 hours may or may not be a little longer than necessary. I believe the pack says 30 minutes but I wanted to ensure full saturation. I've used this with an AQUATEK CO2-Proof tube and haven't had any leaks or problems of any kind. The instructions recommend boiling a mug of water in the microwave and then the end (about the last inch or so) of the tube for about 30 seconds stay in the water for a long time. The hose becomes very flexible and can be tightened very easily. Just be careful when connecting the hot tube to the glass. Depending on your snorkel, this may not be necessary (or recommended), but for the snorkel I used, tightening the snorkel without breaking the cone was absolutely necessary. The hose is now very secure, there are no leaks. The suction cups are very secure. In fact I'm having a hard time getting it out of the tank, the suction power and the way the suction cup attaches to the diffuser is top notch. I would recommend these to anyone who needs a CO2 diffuser and I think I might get a few more of these.
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