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Oase bio master 850 noisy air problems

Joanne.S

New Member
Thread starter
Joined
25 Mar 2022
Messages
3
Location
Norway
Hey guys any help would be appreciate. My Oase 850 gets trapped air, there is gurgling in the pump then a whoosh of air going into the tank.
any ideas how I can stop his.
I have a 450lt discus tank with one 350 bio master and one 850 bio master. it’s driving me nuts
 
Solution
It's quite common for canister filters, generally caused by small amount of air being sucked in on the inlet side of the pump, using through pipe connections. The amount of air is generally too small to detect and it can happen even when the pipe work looks like it is well connected. It can also happen it an air-stone is too close to the inlet and bubbles are entering that way.

The easiest way to think about it is that the pump is sucking water through the inlet pipe and blowing it through the outlet pipe. The sucking can draw in air through pipe connections, and the strength of the sucking force is also dependent on how much water can flow tough the pipe. This a bit of a simplification of the physics, but I hope you get the idea...

adriancarr

New Member
Joined
9 Feb 2022
Messages
13
Location
Edinburgh, UK
It's quite common for canister filters, generally caused by small amount of air being sucked in on the inlet side of the pump, using through pipe connections. The amount of air is generally too small to detect and it can happen even when the pipe work looks like it is well connected. It can also happen it an air-stone is too close to the inlet and bubbles are entering that way.

The easiest way to think about it is that the pump is sucking water through the inlet pipe and blowing it through the outlet pipe. The sucking can draw in air through pipe connections, and the strength of the sucking force is also dependent on how much water can flow tough the pipe. This a bit of a simplification of the physics, but I hope you get the idea.

The solutions are:
1. Put hose clips onto all connection on the inlet side.
2. Make sure any flow regulators on the inlet side are fully open. Only control the flow on the outlet side.
 
Solution

Joanne.S

New Member
Thread starter
Joined
25 Mar 2022
Messages
3
Location
Norway
Thank you for your advice, I will check all the connections and piping, continue to tilt and see how it goes.
I will keep you updated 😊
 

DogTailRed2

Member
Joined
23 Sep 2021
Messages
68
Location
UK
I have an Oase 850 Thermo and a 600 Thermo.
They start sucking air when the pre-filters need cleaning or when the fish knock an air stone into the path of the inlet which is always worth a check.
 
Joined
17 Mar 2012
Messages
1,733
Location
Dorset
I’ve run six different canisters over the years and never had one of them suck in air, including my 350 Biomaster.
After cleaning I’ve always rocked canister filters gently to expel the inevitable trapped air. The Biomaster though seems very good at getting rid of the air so doesn’t seem to need much rocking. Maybe I’ve just been lucky.
 

DogTailRed2

Member
Joined
23 Sep 2021
Messages
68
Location
UK
I’ve run six different canisters over the years and never had one of them suck in air, including my 350 Biomaster.
After cleaning I’ve always rocked canister filters gently to expel the inevitable trapped air. The Biomaster though seems very good at getting rid of the air so doesn’t seem to need much rocking. Maybe I’ve just been lucky.
Maybe you just clean yours more than me :) It's not trapped air. It seems to suck air in from somewhere when it's blocking.
 

Gold Fish

Member
Joined
30 Jul 2021
Messages
51
Location
DE141DX
Hey guys any help would be appreciate. My Oase 850 gets trapped air, there is gurgling in the pump then a whoosh of air going into the tank.
any ideas how I can stop his.
I have a 450lt discus tank with one 350 bio master and one 850 bio master. it’s driving me nuts
Hi Joanne,
I have few questions: can you let us know when whooshing is happening during the day? Do you have plants and how many? Are you having co2? Glass lily pie with skimmer on the suction pipe? How long are you hoses and do you have any additional on line gear?
Maybe, you post some pictures of your filter system form the entry to the exit.
Regards
 

FISHnLAB

Member
Joined
4 Aug 2022
Messages
296
Location
Ontario, Canada
It's quite common for canister filters, generally caused by small amount of air being sucked in on the inlet side of the pump, using through pipe connections. The amount of air is generally too small to detect and it can happen even when the pipe work looks like it is well connected. It can also happen it an air-stone is too close to the inlet and bubbles are entering that way.

The easiest way to think about it is that the pump is sucking water through the inlet pipe and blowing it through the outlet pipe. The sucking can draw in air through pipe connections, and the strength of the sucking force is also dependent on how much water can flow tough the pipe. This a bit of a simplification of the physics, but I hope you get the idea.

The solutions are:
1. Put hose clips onto all connection on the inlet side.
2. Make sure any flow regulators on the inlet side are fully open. Only control the flow on the outlet side.
Yes, it definitely could be all of those things or possibly just because he's running an Oase.

Many, many people have this issue with Oase and not with several other canister filter brands/models from my research. Personally, I think Oase has a design flaw(maybe too many seals in the design or just poorly designed ones that are prone to leaking air if not seated absolutely perfectly) that even seams worse on the Thermo models. All you have to do is look around as there are whole threads on the issue. I don't see many threads about this if any with some other brands.

I was going to buy a Oase Biomaster Thermo but, all of the issues I read about caused me to go another way. I have no personal experience but, I just thought I would point this out in case the OP wasn't aware.
 
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