Hello... I have read somewhere (The Krib?) that silicone tubing can leak out
30% of the CO2 gas bec. of the permeability of the airline. CO2 tubing is
made from different materials that keep this from happening.

As for the parameters of the setup, maybe it's the diffuser.

"Iain Miller" wrote in message
...
I want to put CO2 into my new 275 litre tank and am looking at the JBL
proflora 3 set which comes complete with a PH meter.

Only issue is it (and many of the other sets I've seen) says its for tanks
upto 200 litres. Why is it limited like that? Surely I can just inject
gas
at a faster rate in a bigger tank - or is there some issue with the size
of
the diffuser? If this is the case can I just put a T piece in the CO2 line
&
run 2 diffusers to increase the output?

Lastly what is so special about "CO2 Hoses" - will ordinary airline not
work
or will it rot or dissolve or something if used for CO2?

rgds

Iain