I've used this item for several months now for direct injection after replacing the CO2
ceramic air stone I had running previously.
I've copied a link and blurb below for reference. Price is Australian so could be cheaper or more expensive elsewhere.
The attraction was that it should be more efficient than a glass or ceramic air stone. When working, I can just see the odd air bubble escaping every so often. Whereas the air stones always had a fine mist of bubble rising up 2 and a half feet to the surface. I also didn't really want to have too many bubbles getting sucked into filter inlets (it's a big tank to drop co2
I did look at inline diffusers on the canister filters but I have a wood stand surrounded by wood book cases and trying to work with filter hose plus the risk of leakage just didn't appeal. The tank is 150 gal
so it's basically going to sit there until the house falls down.
The unit is rated to almost twice that and I have it connected to a ph solenoid. Still debating if I need two of these but it has been doing the job.
The main trouble has been that in the last month it has developed an awful rattle in the pump housing. I believe this is air trapped in the housing. Possibly this is because the diffuser turns on and off at the same time as the co2
I've just changed it to run non- stop (nothing like changing electrical connections one-handed behind the stand). I'm hoping that this will mean air or gas never has a chance to build up so it locks the unit.
I've got this week to get it sorted out or it's the bin. So basically very happy when it works and in deep trouble when it doesn't.
Age of Aquariums - Tunze CO2 Diffuser - 7074.500
Carbon dioxide distributor used to introduce higher CO2
volumes into fresh-water aquariums when little space is available. By means of a universal magnet holder it is attached directly onto the glass of the aquarium and ensures a distribution of up to four CO2
bubbles per second. In the aquarium the diffuser operates as a “stand-alone” solution with a small submerged pump which draws in the water and thoroughly mixes it with CO2
. Dissolved CO2
only leaves the unit; no carbon dioxide is wasted. The diffuser is suitable for aquariums up to 1000 litres.
Pump & Magnet included
Made in Germany
2 year warranty