Eheim Classic 2213 Playing Games With Me

[st24rsap]

i have a eheim classic 2213 which i have had for approx 2 months now. The last week the flow from the filter has majorly reduced down to about 60L/hr instead of 400l/hr it should be.

i removed all of the pipes and shut off valves and cleaned everything so there are now no blockages.
removed the filter media basket and cleaned all the goop off of it and made sure the media wasnt too compact.
checked the o-ring seal which was fine
removed the impella and shaft, cleaned, checked seals etc and re-fitted.
primed it making sure no air was in the filter
started it back up and it was fine, flowing about 400l/hr.

this was a few hours ago and since then it has stopped working twice. the flow reduces rapidly, then will pick up again it does this several times and then will just stop working. prime it again and set it off and its fine for a while, then just stops again

it seems like there is somehow an air leak which slowly draws in enough air to stop the filter working but i cant find any leaks so dont understand whats happening. i know by the morning that the filter will have stopped which is slightly worrying

does anyone have any ideas or suggestions please

 

[st24rsap]

problem solved i think

 

[Mr._Fishy]

What did you do to fix it?

 

[st24rsap]

well the problem wasnt the filter, it was me overlooking a small point

SMALL TIP FOR EVERYONE: do not place your filter inlet directly above an air stone!!!

 

[CFC]

no thats not a good thing to do, trapped air bubles play havock with canister filters.

 

[st24rsap]

i didnt think about the air stone, was so busy stripping the cansiter and all the pipes etc and looking for air leeks i didnt give the airstone a second thought. quite amusing looking back on it now but i was so frustrated at the time it was driving me mad as i couldnt find any leaks lol

needless to say filter is now working a treat and flowing 400L/hr