Air/ co2 in filter

[simon Coram]

I seem to be getting co2 into the filter. It seems to burp out gas more than it used to.
All the same i havant moved anything.
Ive got a shrimp filter sponge over the intake, could this cause any problems.

Does anyone else have problems, what do you do?

 

[ian_m]

Could be, as you are restricting the inlet, with the sponge, the impellor is cavitating (bad bad bad as will cause damage) and pulling dissolved gas (air & CO2) out of solution.

If you ever need to restrict the flow of a pump (any pump, shower pump, water pump etc) you must always restrict the outflow and never the inflow.