You need to contact Energy Savers Unlimited Customer Service prior to attempting any type of repair your self. (310)851-8999 They will tell you if you can resolve the problem yourself or if the unit needs to be sent back to them. Also, note, recommended in line installation with a Magnum would be to run your return hose to a "tee" fitting, with one line returning directly to the tank and a second line feeding the UV sterilizer. We would also recommend a ball valve in line wtih the UV to regulate flow. You would then have a second return from the UV back to the aquarium. If water ran from the canister directly thru the UV without the bipass or flow regulation line, you are probably moving water faster than the manufacture's recommended flow....reducing contact time and reducing "kill rates". With the bipass line installed, you can run the UV and the canister filter all the time. Regards, Scott Robins Aquatic Interiors, Inc. --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html --- ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/