instead of having a glass diffuser, can i put the end of my co2 line near the filter intake pipe so that the co2 bubbles get sucked up? is this a reliable method? my glass diffuser broke and cleaning a difffuser is just one more thing to do on maintenance day. does this method get better or worst diffusion? thanks
I would advise against putting it near the intake if it's going to be permanent. CO2 may corrode your impeller after so long. It'll do what you want, and as darkblade said, it's noisy and may cause the impeller to seize up.
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I bubbled CO2 into my Eheim intake and the bubbles completely dissolved before they reached the canister (I could watch through the green tubing). I did this for many years.
If you were to do this, you'd need a certain length of tubing. His length of tubing might not be the same as yours was. Also, the CO2 concentration is still higher when it reaches the impeller than if it were to be diffused in the tank and then taken to the impeller through normal filtration. Which still can corrode certain impellers after a long time. CO2 and metals don't go well together.