Injecting CO2 into the return

I am planning on injecting the CO2 in to the return from my wet.dry filter.

The basic plan is to extend the intake of the pump a few inches with PVC pipe and inject it into the pipe before it goes through the pump.

How to do that? Should I just drilll a small hole stick the tuning in the hole and seal? Should I use an air stone?

Thoughts?

BTW 90G Tank

Pressurized CO2 setup, not yeast based.

lazyNode said:

I'm not familiar with wet/dry filters, but I would be doubtful about sealing the Co2 tube into the intake - it may cause a vacuum, and you don't want to end up with a tank full of yeast.

Try the airstone.

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