My unit is constantly purging air. Is there a solve for this issue? I recently bought mine just a week ago.

It is Amazing to me how Oase will not admit they have a problem with their Biomaster line . I have dealt with Douglas Ward ,President at Oase and Factory rep. Adam Raabe Aquatics Category Manager (North America) Both of them will not acknowledge there is a purging issue . If you look at the design of the filter you will find that whether it is the 250 or all the way up to the 850 they all use the same head unit all that is different is wattage and impeller . Foot print of the the whole biomasters is also the same except for height of canister . From my own personnel experience Biomaster 250 has no purge issues . Biomaster 350 for me purged from day one when I got it in 2019 .Biomaster 600 purged right from Day 1 and is still purging with new head unit and also larger diameter pre filter pipe with 3 times as many holes than stock . Also coarser pre filter sponges . If you look on line it looks like Biomaster 850 is even worse . Where I am going with this is that the whole basic design is built around dimensions of a lesser flow filter and there in lies the problem . All the silicone in the world on orings will not help the issue . When I took the impeller from the 350 and put it in the 600 head the purging lessened ,still there but less frequently . What I have found is the problem is cavitation inside the housing and trying to get more flow from the filter with the same basic dimensions is what is the cause . Simple hydraulics . Where the impeller sits inside the head is the same size no matter what biomaster you have ,I know this because I have the 250.the 350 and the 600. When you call oase they will try to tell you that is you put a pre filter sponge on the inlet tube in the tank it will cause a restriction and you will have purging BS!!! I am using a very fine sponge on the inlet tube of my biomaster 250 (it is in a shrimp tank) and I have let it go until that sponge was caked in mud and had NO purging ,even when I shook the sh!t out of the filter. The design of the Biomaster line is made for the 250 and the 250 alone . It's no secret there is an issue with that filter . I have an Ehiem 2217 since the 1970's and Two Fluvals 07 series . I have been in the hobby now for approximately 60 years and I have owned many filters over that time going back to the leather belt drive piston air pumps and the old Supreme hang on back filters ,I know something about filters. Oase knows they have a bad issue but does not know how to fix it without getting rid of the 350 ,600 and 850. To conclude here is a little tip ,get yourself a smart switch ,something like a Kasa . Set it up with a schedule where it switches off at least twice a day for a few minutes and comes back on . What will happen is that it will do a purge when it comes back on that will lessen the frequency of purging throughout the day . What you would be doing is what Fluvals FX built in feature does to purge built up air in filter . Unlike Oase Fluval needs only one on off per 24 hours . Smart switch will not cure problem but will lessen the purge issue considerably .

hi I’m having trouble with this filter. It’s taking in air and it’s starting to make weird noises. who can I contact for warranty help? Thank you :)

Hello. We are sorry to hear that you are having an issue with your BioMaster Thermo 350. You may contact our Customer Care Team Monday through Friday between the hours of 8:00AM- 6:00PM ET. Our Team looks forward to assisting you!

Does the heater have its own power source? In other words is it independent of the filter. I want to be able to hook the heater to a temp controller.

Hi, The built-in heater provides your aquarium with precise and uniform temperature levels with adjustable control. The heater is on a separate power cord from the filter. Hope this helps!

does this come with activated carbon foam/media?

Hi, I purchased my biomaster thermo 350 1 year ago and has been running flawlessly ever since. Now, with the stock csrbon prefilters I had minimal purging.... So i switched to the blue 45 ppi and it was much better.... Then I purchase the red 30ppi and I guess 3 times is a charm... No more purging except the first 10 minutes after cleaning them... Then I am good to go for 3 weeks roughly and I will notice a slight decrease in flow and a few light purges which I've come to love. It's a simple reminder.... Hey, clean the prefilter. Do not listen to the ' gunk it with vasoline and buy metal hose clamps. I also have a second 350 and a 250 on my 15 gallon set up. My advice is really take your time conecting the hoses. I use clear hose and lily pipes... So I can't adjust the flow... Am going to get some double taps from oase now that they're available. Lastly, when I switched to the red 30 ppi pre's I notice avery dramatic increase in flow... Hopefully, this helps... I was kinda annoyed at even one purge when I first bought it... But, give it time... Carefully going over each connection. I use no lubricants of any type...just water from the tank... And all filtrrs are set up bottom tral blue stock sponge, all folling trays seachem matrix and top tray stock red foam. Only fill the trays about 3/4th with matrix. Don't stuff it in. The trays might sit uneven and cause issues .....anyway, best of luck...

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🔥 Elevate your aquarium game with precision and style!

SILENT YET POWERFUL - External filter runs quietly, maintaining a peaceful environment for both you and your aquatic life.
COMPACT SLEEK DESIGN - Space-saving black unit blends effortlessly into any modern interior without blocking your view.
OPTIMIZED BACTERIA GROWTH - Hel-x suspended media maximizes beneficial bacteria surface area for superior water quality.
QUADRUPLE FILTRATION POWER - Biological, mechanical, chemical, and pre-filtration stages guarantee crystal-clear, healthy water.
SEAMLESS TEMPERATURE CONTROL - Built-in heater ensures stable, even warmth without disrupting your aquarium’s aesthetic.

The OASE Indoor Aquatics Biomaster Thermo350 is a sleek, Italian-engineered aquarium filter with an integrated heater, delivering precise temperature control and whisper-quiet operation. Featuring a 4-level filtration system enhanced by Hel-x media, it ensures optimal water clarity and a thriving aquatic environment—all in a compact, visually unobtrusive design.

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Color	Black
Size	16 W / 9.4 IN
Manufacturer	OASE
Included Components	Aquarium filter with heater, filter media, tube, intake, spill pipe, diffuser, spray bar, fittings, power cable
Material Composition	Plastic
Product Dimensions	23.88 x 23.88 x 42.42 cm; 5.7 kg
Package Weight	6.9 Kilograms
Batteries Required	No
Batteries Included	No
Country/Region	Italy

OASE Indoor Aquatics Biomaster Thermo350

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