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.
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.
The Fraternity of Dirt
If at first you don't succeed,,, keep kicking it RubberSideDownOnTheLanding, 2-75g planted, 5-55g planted, 5-20g planted, 110g w/30g sump, 8-10g, Refugium, doghouse/newbie 2012 update adding table top pleco pans & a 90g (Nutz)
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.
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.
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.
"We are living on this planet as if we have another one to go to". T. Swearingen
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.
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.