The new EHEIM Air pump 400 comes complete with EHEIM diffusor and air hose. The pump is ready to use, you will need no other equipment. The EHEIM Air pump 400 is continuos ulta-quiet and the air flow level can be adjusted on the pump.https://www.aquaristikshop.com/aquaristic/EHEIM-Air-pump-400/3704010/
- Frank S. wrote about EHEIM Air pump 400 in 2016:
Though the pump is very powerful and handt with two outputs, it's difficult to set them at equal bubble rates.
The position of the tube influences the power and the manual diffusers are tricky to adjust after a while. Custom air stones are more satisfying.
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