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Spray bars tend to spread the flow better than the duck bill shaped outlets, the glass outlets with the bell shape on the end are also very good. Yes, just look for the amount of bubbles entering the tank, and compare that to the amount of bubbles you are adding to your reactor. If your reactor...

Many people do connect their CO2 to the filter inlet with no adverse effects. However, some have reported errosion of filter seals, noisey pumps and frequent replacement of the impellor. If you CO2 reactor is efficient it should be fine to connect it to the filter outlet, just check on the...

Adding the CO2 to the filter inlet does ensure good absorbtion and It does not seem to affect filter bacteria. However the effect of the CO2 on the impellor and filter's seals can be very detrimental, and some filter manufacturers do not garantee their products under these conditions. Cheers, James

I heard that they somtimes jam up due to trapped dirt, apparently this can be cleared with a blast of compressed air. Cheers James

My JBL set has a 5-10 minute lag when it turns on but it switches off ok. I think the reason for this is that I had water syphoning back into for some time (maybe i'm wrong and these solenoids are water proof). Have you taken the hose off of the solenoid to check for moisture ? Cheers James

CO2 distribution can be tricky with HOB filters. Your best bet would probably be to place a ceramic disc diffuser directly beneath the filter outlet. You will loose some CO2 via the suface disturbance caused by the HOB filter, but distribution is very important. You can always up the CO2 to...

I did see an interesting DIY solution for very small tanks. A chap had the idea of inserting a cigarette filter tip into the end of a clear airline hose, see link below, there is a video of it working at the bottom of the page...