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post #1 of 6 (permalink) Old 04-03-2008, 10:54 PM Thread Starter
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Old Fluval 403 question

Just hooked up an old Fluval 403 that was still in original box but had no hose or rim connector so I did some DIY work with 5/8" flex vinyl tubing and rigid pvc. My question is regarding the possibility of back siphon should a hose come undone or something in my cabinet. I'm not worried about the return (spray bar) as all of the little holes in the spray bar would soon defeat a back siphon, but what about the pick up tube. I used the original tube but see no measures of prevention such as a drilled hole on it. wondering if i shouldn't just drill a small hole about an inch under the water level. any thoughts?...
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post #2 of 6 (permalink) Old 04-03-2008, 11:20 PM
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If you are worried about the connections you should use hose clamps.Drilling a hole in your pick up tube would work for a safety precaution,however it would have to be far enough down in your tank so that you would not lose your siphon every time you did large water changes.


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post #3 of 6 (permalink) Old 04-03-2008, 11:41 PM
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Why would it back siphon under normal operation?

Last edited by EdTheEdge; 04-03-2008 at 11:43 PM. Reason: brain fart
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post #4 of 6 (permalink) Old 04-04-2008, 12:04 AM
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I think that cmchap wanted added security in case he lost a hose and his filter started leaking.If a hole was drilled into the pick up tube then the siphon would stop as soon as the tank reached the level of the said hole.


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post #5 of 6 (permalink) Old 04-04-2008, 12:11 AM
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Oh. nevermind.
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post #6 of 6 (permalink) Old 04-04-2008, 01:40 AM
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Quote:
Originally Posted by lescarpentier View Post
If you are worried about the connections you should use hose clamps.Drilling a hole in your pick up tube would work for a safety precaution,however it would have to be far enough down in your tank so that you would not lose your siphon every time you did large water changes.
That is good advice for any cannister filter. I learned the hard way what happens when a filter back-siphons water after a failure. I later drilled a hole in the intake tube and the next time it happened, I had much less water to clean up.

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