help with noisy ehiem 2213

[enhanzed]

recently my ehiem 2213 getting quite noisy ..don't kniw why ..last time i just tap it abit ok liow ..now quite noisy .. it was given to me by someone else i estimate it to be about 2-4 yrs old/

what is backwash and how i do i operate it ? how often should i be washing the sponges in the 2213 ?

any idea how much the eco series cost ?

[PeterGwee]

Check the impeller first and see if there are cracks and etc.

Regards,
Peter Gwee

[enhanzed]

found the problem...the rain bar i bought was clogging it ...holes too small maybe