The felt washer of the EHEIM outlet may become clogged after some time. This will lead to an increased counter pressure reducing the flow rate and increasing the wear to the diaphragm. You should therefore replace the felt wahser of your EHEIM outlet at regular intervals. Please change also the Air filter of your Air pump regularly.
- minhaj j. wrote about EHEIM Air filter and Felt washer in 2020:
its good to get these spare parts cheap
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