10-29-2006, 10:34 PM
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I've got several models of Eheim canister filters. Do you have the Classic filters or the Eheim Ecco or Eheim Pro filters? Ecco and Pro filters have self priming. On the Pro II's, you have to press the prime button a few times. Make sure you don't close off the tubing, so water can flow through. On the Eheim Eccos, you need to close the handle half way, which would start the prime. You may have to do it again. Just make sure you have the canister filter full of water first, before you prime it, otherwise, you will have to prime it allot of times in order for the canister filter to get filled up.