Filstar seals - silicone or vaseline
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Old 06-26-2009, 04:41 PM   #1
dizguy
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Filstar seals - silicone or vaseline


I need to give my xp3 seals a bit of lube since i'm getting some air in the filter. Does anyone know if Rena specifies using silicone or vaseline / petroleum jelly based gels for their seals?
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Old 06-26-2009, 05:12 PM   #2
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I had an air leak in my XP2 that drove me crazier than I am.
It made a loud “spitting” noise which was very irritating.
I bought an extra set of seals/gaskets from PlanetRena.com.
I used vaseline to lube them. BUT, that did not stop the air leak.
I read on another board to use electrical tape and seal the inlet
neck from below the water line to up and around the hose.
That stopped the air leak for me. I even called customer service
at Planetrena and they were very helpful. They have pictures
of all available parts and a great FAQ section.
I also read that electrical vinyl tape is aquatic safe.
Charles
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Old 06-26-2009, 05:18 PM   #3
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Petroleum based lubricants will deteriorate certain rubber O-rings/gaskets over time. Better to use silicone based lubricants.

That said, I don't remember what Rena recommends.
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Old 06-26-2009, 06:55 PM   #4
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Food grade (FDA) approved for silicone based O ring lubricants. It’s not that big a deal to find as local Auto Zones, parts stores, hardware etc. have it and the counter help won’t even know. But in the fine print it will contain the approved for food processing equipment language and your good to go.
Generic cheap stuff can have toxins in it.
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Old 06-27-2009, 01:52 PM   #5
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I have long suspected that the inlet fill cap probably leaks a bit, resulting in the air leaks many of us have with those filters. Maybe a cheap "O" ring insert would solve it, but I haven't bothered to try yet....only thing I don't like about my 3 RENA's.
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Old 06-27-2009, 04:18 PM   #6
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If you really think that's the problem, put a paper gasket from a prime bottle in the cap.
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Old 06-27-2009, 08:00 PM   #7
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Thanks for the guidance people. A friend had some silicone for his pool pump seals that was safe. In regards to the fill cap, I removed that whole assembly after the cap cracked from many years of use. I used to put a little teflon tape on the threads to help with that air leak as well as between the other slip fittings. It worked like a charm and didn't leave tape residue everywhere.
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Old 06-27-2009, 11:12 PM   #8
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I called Mars Fishcare (they own Rena) because I was having air constantly come out of my spray bar if I turned the flow up to any degree. The rep told me that 9 times out of 10, the reason for air coming out of the outlet is due to hose issues. Either the hoses are too slack or too taut. I removed the slack out of my hoses and it helped quite a bit although there still is some air being expelled.

If you want to call Mars Fishcare, their number is 800-847-0659. They seem real helpful.
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Old 06-28-2009, 12:04 AM   #9
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They answered your phone call! I'm amazed. I called Monday and never got a reply. They used to have such great customer service...
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Old 06-28-2009, 09:23 PM   #10
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Wow...I guess I was lucky!
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Old 06-29-2009, 01:10 PM   #11
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Don't see why the hose length should be a cause for air entering the system, but I guess if you tried it and it helped there must be a reason.
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Old 06-29-2009, 08:53 PM   #12
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I agree; I don't understand it either. That's what the rep told me and it definitely did help.
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Old 06-29-2009, 09:53 PM   #13
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When the hoses are short, the force of the suction is neutralized by the relatively easy draw down of water from the aquarium. As the hoses get longer, the water cannot be replaced as easy. The seals throughout the suction side of the system then become compromised, letting air in.
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Old 06-30-2009, 10:00 AM   #14
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OK, but it still comes back to the seals not sealing properly, or it wouldn't matter. I'm going to try the teflon tape and maybe some sort of gasket in my fill caps and see if that doesn't work. It's not a big problem, just annoying.
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Old 06-30-2009, 01:08 PM   #15
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Sounds good. Just remember to not overtighten that cap or it'll crack. By the way, do you use the dinky little hose clamps they give you or the metal kind? I changed mine to metal and it also helped.
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