My Honest Opinion About The BIOMASTER 850 From OASE - SOUND TEST - FLOW TEST - HEATER TEST 

I have two Oase thermo 600's and I found there is a design flaw, the pre-filter down tube has too few holes to suck up water. So I took a drill and added four times more holes in the down tube, and I changed my 60ppi (black) sponges out and replaced them with orange sponges (30ppi) and the filters no longer burp and even pump out more flow than before.

I've been using the 250 in a 60p and agree with your findings. With the constant burping I find tilting it in all directions after any maintenance to the filter helps. If any of the hoses are touching the cabinet it can cause an annoying noise. Hope that helps anyone:)

Truly enjoyed being educated on this filter!!! I am upgrading and purchasing a 600 gal aquarium for my Discus and I love the built in heater feature!!! It may add to the cost but such an easy to use quality!!! Love all you Videos... Thank you for your content!!!

Love this channel and I think that filter looks super clean and aesthetically pleasing compared to most.

My filto smart 200 still burps after 3 months. Great honest review! Nice to see a real review with tests 🙌

Great video, I've been thinking about picking up this filter so your review is really helpful!

I appreciate you’re hard work in this video! Very useful!!:)

I appreciate your informative videos. I have used the Biomaster 350 for 2 years. To remove the pre-filter from a short cabinet, tilt the top of filter towards you rather than pull entire filter out. Also, in my experience the bubble burps are primarily cavitation effect. To reduce or eliminate the burping, I reduced the output flow,. I understand that may not work for you as you find the flow is already to0 low, but it worked for my situation.

I never miss your single video. I am a big fan. Thank you for sharing such a wonderful information about OASÉ BioMaster filter. Always looking forward to your videos. Lots of love. 💚🌿🌱☘️

I think the measured flow might still be slightly optimistic because the catch bucket was lower than your aquarium or any typical one. Extra height would probably diminish the flow.

Nothing better than a handy handle 😁Thanks for the great review!

I got this filter (600) for two years now and I still think it's great. For the gurgling sound, the solution is to seal the prefilter with petroleum jelly for aquarium seals. Also, after cleaning the pre-filter, pump by hand a few times, and after activating the filter, run it for a moment at half flow until all air bubbles have fallen out. sometimes it is also worth tilting the filter in different directions for a moment. p.s. when you measure the volume level in a cabinet, it increases because the cabinet is a resonance box.

Thanks for the information it was very useful, just 3 days ago I bought my Oase 250 filter, today it arrives

I really enjoy your vibe and level of detail!

This is amazing thank you so much for all the info, im in the market for one as i have a 1,2m tank thats going to be set up in December, so im learning so much of your channel, amazing amazing amazing! Love it, keep it coming 🥰

Sound and practical tests. I like the filter. Thanks for the video, very informative.

Great extensive review 👏🏻👏🏻👌🏻👌🏻thank you!

Your review has helped me decide between Fluval FX6 Canister and the Case BioMaster 850 Canister with Heater. You're knowledgable and professional but most importantly patient, and for that I'm thankful. I'll be watching your channel for new ideas in Aquariums and the product lines. Thank you!

I love this filter!! Best I’ve ever had. Mine has never made the burping sound that wasn’t quickly fixed by priming it till it stopped.

Loved this video. I do really like the removable pre filter major plus, having to pull the whole unit out from under the stand in order to clean the pre filter is annoying. Thanks you for your honest review 👍👍

Nice video amd great information! The only thing I think I would have done differently was the flow test. If you kept the bucket at the same hight as the top of the tank the head height would have been properly accounted for. However, it is probably such a minor difference that it wouldn't really matter. Just my thoughts. Really enjoying your content, keep up the good work!!!

Great informative video. I am using a Biomaster (350) for a while now and I became a hugh fan of this type of filter. Especially because of the prefilter. I am going to get Biomasters for my other tanks as well. My Biomaster only 'burps' a few times after cleaning the prefilter, but after an hour or so, I seldomly hear it 'burp'.

Hey buddy, I just got a Oase Biomaster 350. I did a bunch of research in this and the flow you got has a few factors at play such as your PPI on your pre filter. If it's higher it'll take more force to pull the water through, not to mention all the gunk you've already collected. Thanks for the video!

Many thanks for this remarkable and highly detailed review!

great review. I really love my Oase Biomaster filters though I have the smaller ones.

My fluval 307 "burps" a lot, but it turns out that was the skimmer from the Lilly pipe, I blocked it and never again. Great video, one of the best reviews I've seen!!!

Interesting review thank you. As one of the other comments stated you can drill another 20 holes in the prefilter pipe to increase the flow. Alternatively and even better, replace the tube completely with a bigger white 21.5mm overflow pipe from a DIY store and drill 40 holes in it. It will fit over the connector rather than inside it. The foam rings will still fit.

I doubled the amount of holes in the prefilter, and swapped all the filter pads for 2kg of Bacto Rings, 3 kg Bacto Stones, 750gr of active coal and 400 gr of Purigen.. the only filter pad that I kept is the orange top one... I have no noise issue nor air bubbles.. I am pretty happy with this filter..

Uncle mj is dripping today

Thanks for an honest detailed review, I had just baught a Oase 600 which I’ll use in an up and coming project. I had seen a fair few reviews about the ” burping “.. In my research . Would be good if you could keep us updated on any possible solutions if any ? I still think the pros of the filter outweigh the cons . That’s why I went with Oase. Thankyou for your gr8 content!! 👍🏼👍🏼👍🏼

Have a 350: pretty noisy at the begining, now it's silent comparing with the cost or Eheim models. 250 and 350 don't have problem with bubbles, but once they're cleaned the prefilter/filter they need hours to expel air bubbles. For example, I also have an Eheim Pro 4 and only needs 2-3 minutes to be free of bubbles. I don't think oxigen and CO2 amount could cause burping, it's the design of the very filter that produces that burping, because my Eheim doesn't make that effect Flow: 1150 litres vs 400 l in real life Thus: flow is a bit dissapointing, but the quality and the lack of noise made this filter one of the best choice Regards of the markwt

really oase have amazing filter, you explain really so amazingly very part. thanks for review legend. goldy

nice and needed review, been thinking about getting a biomaster 350 on the burping with a new filter i think its the air bubbles trapped in the sponges and the noise, ive read somewhere if you put a stone slab on top a foam pad and then the filter on top of the stone slab it would be more silent.

Regarding flow, would be interesting to check the flow rate w/o the inline diffuser vs empty without media material. And with respect to the length of the prefilter it’s actually the same length as the biomaster 600, and so conversely I was expecting it to be one level longer for added pre-filtration capacity. This means there’s empty space below between the prefilter and the bottom of the biomaster which is just empty. Your points about it being hard to remove the prefilter when inside a tank stand is real and I have to keep mine outside of the stand as a result. Great review! 👍

Nice review! Was wondering what filter media you're using inside the filter? I filled up all the trays with Seachem matrix and the top tray is filled with fine filter mesh. But because of that I have to open it up pretty often (flow reduces quickly). Do you only use bio media since you only clean the pre-filter? Thanks!

Great video!!!

Thank You for the informative and interesting vedio. By the way what equipment and app are you using to monitor the temperature and PH levels? Regards

Since you also have worked with the JBL Profi filters, it would be good to hear from you about whether the Oase cylinder pre-filter is more or less awkward to clean than the JBL top basket.

Another great video!

Also think using the jet end of your output will probably be quicker than the diffuser on the end that will slightly slow this down

In setting up my first aquascape - still a work in progress - I originally considered this filter but after looking at various reviews particularly the reviews on Pimp my Filter - I opted for the Aquael Ultramax 2000. It has a prefilter and in my view a greater capacity for filter media, it also has a much better flow rate without the need for the considerable modifications suggested in the Pimp my Filter review. Admittedly it lacks the internal heater which would be a great addition but my main requirement for a filter is it's ability to filter - so for now I'll live with this little irritation..... Thanks for all your videos, they have been a great source of inspiration for my first venture into aquascaping..😊

My 850 thermo has been running for a week now. Can hardly hear it, water quality is ecactly what i want. Its on a 250l tank. Very happy as if we get more fish growth then we are good. Add that to the 12l of crushed lava rock and we can take biomedia out to start other tanks easily. Best filter ive ever owned, ive had a few now

The best video review ive seen! Thank you so much! Now a question. How much decibels does it measure from the outside once the cabinets doors are closed?

The pre filter is a great idea, but needs a different design. Maybe horizontal or diagonally placed?

I recently got the 600T. I've seen some suggest tilting the filter to fill the air pockets inside the filter to make it more quiet. That is not really a good idea. When I opened the two locks, I had water gushing out the pre-filter side. Thank you for the honest opinion video!

I have an eheim 4+ 350 and it also burps it’s definitely a c02 problem as it occurs at the same time towards the end of the day when the co2 has been on. I’ve also tested it for a week without co2 and no burps.

Excellent review. I’m getting the 350 one. Do I need a UV light for my new 70 Gallon Freshwater aquarium? Thank you for sharing.

Let us answer the most important question: 10L of Mayonnaise?! What were you eating?

I have Biomaster 600 Thermo and I never had problems with bubbles... I have 200l tank and Oase 600 working great.... i hardly hear the canister... Im using lily pipes so I cant adjust flow , but in the end Im really happy with this filter. I wanted to get 850 but couldnt get in my cabinet cuz he have one more basket then 600.... anyway , people fill the baskets with matrix...fine mesh and purigen at the top and you will be fine.. Awesome filter!

I'm running the 600T on a 360l tank. Picked it for the internal heater and prefilter. It's in a cabinet under the tank so can barely hear it. Haven't opened the main body yet but clean prefilter every 2-3 weeks. Changed the Helex for Biohome. Performed flawlessly. Not mega flow but my water tests are all good so must be sufficient. Recommended.

Nice video again, i got myself a 250 for 60 liter aquarium. More than happy with it. About the brups, no issues here. Got hem only in the first minutes. I shake the filter a few times and it is gone. If I have burps most of the time i drink too much 😂

What about installing a flexible drilled hose mimicking the original one but able to be taken out by bending it over? That would save room above the filter and you wouldn't need to pull the filter out from the cabinet to clean the prefilter

nice video. safety feature to have automatic shut off if power loss. does it have

Great video . Oase or fluval which one will you pick?? I have 66 gallon tank I have 3, 5 inch oranda goldfish which oase should I get ?? Thank you new subscriber

this brand looks great .for now i have two Tidal 110 From seachen and I'm happy

Make a video about the Jbl cristal canister filter that you have. Great video as always! 👍😊

I think the "burping" is more prevalent in larger filters. I have a cheap canister filter of likewise size, and it burped for about 2-3 months. I'm not sure it's a design factor, and this it's more a volume factor?

Love the Channel. Principal fonction for a filter is to filter. so that mean each box capacity, and the flow, must be according to bacterian populate, and the fishtank health. With these flow rating, that's be complicated to maintain a basic balance. marketing has been there

Hi MJ. I am planning on a setup of a 55 gallon tank (or possibly larger). I have been researching canister filters with heater option. Your review came at a perfect time. Your info is always so helpful and appreciated greatly. Thanks a lot and have a great week. 🏄🏼‍♂️ (surfs up- can you tell I am in Southern California?)

Update on the big shallow please! It’s looking good!

Hey, i have a Thermo 600 to, noisy at the start, yea. My only surprise is: i have a 2nd filter: Fluval 405 and it's so mutch powefull (but also doing more noise) , pretty wierd.

Great video again! I have the 250T, 350T and the 600T (also JBL and Eheim filters). The flow is a bit lower than that of the Eheim and JBL filters, but can be improved by drilling extra holes in the intake tuber inside the pre-filter. Also I think that in your case you are losing some flow with the reactor. I don’t have the Burping issue in mine, with the exception of the tabk where I am using the Neo-Flow lily pipes. The integrated skimmer is pulling in air every now and then. I absolutely love these filters because of the integrated heater and pe-filter. I also suffer from lack of cabinet space to lift the pre-filter out, but I lean my filter over towards me to lift the pre-filter instead of taking the filter out. I spill a bit of water doing so, but its managebleable.

So, when are you installing the sliding tray for the filter :D

In other video you mentioned aiming for 6 to 10 times worth of water cycling per hour, does this mean this filter would only be good for a 60 litre tank???

@MJ Aquascaping: I see you still use the intaqo, how often do you recalibrate the co2 probe? I never made the jump to co2 computer due to the recalibration requirements(every 2-weeks/monthly) but I wonder how it has been for you:)

Great video! I own the biomaster thermo 600 same issue with the burping sound every once in a while. However doesnt the air mess up the Co2 reactor?

Thank you!!

Canister filters have low flow rate and rarely cycle the water when u have to put both input and output together. I use them in small tanks only. But lately I found great pleasure in using uv sterilizer and I'm starting to think a canister filter with built in uv will be awesome. Uv sterilizer is my secret weapon against algae and having crystal clear water and glass. It requires diy so you can have it before the biomedia stage of filteration.

Hi mate, I had the 600 and the pump is so noisy that I had to get back to my Aquael, I think that oase should work on this because all the other filter I had (Jbl, oase and eheim) were much more quieter…too bad because all the others features are very cool!

Could you tell me what out let you are using please. Thanks

I have a 20 gallons tank and I bought the Oase filtro smart 100 but the flow is very slow, almost no flow in the tank. I have no fish yet but I’m getting the fish in a few weeks. Any ideas on how to increase the flow? I turn it up to the max but it still very slow.

I think the only issue with Oase Filter is the flow, i mean for a top of the line filter at 1550L/H is really low. Mid range filter like Fluval or Bioscape already sitting at 2200L/H plus Would be nice if you do a flow ccomparison between Oase & other cheap brand see how different it is :D

I have the 850 as well. After I have cleaned the pre-filter and switched the valves back to the 'locked' position, I find that I have to pump the priming mechanism far too much in order to get water back in the filter. What am I doing wrong? Maybe someone can offer a solution.

3:14 made me chuckle because I literally planned and shot half of a video the other day about how to avoid flooding your fishroom by accidentally removing the pre-filter first. But like you say, the safety mechanism makes this impossible. For whatever reason, I managed to open the pre-filter on its own once ages ago, but it must have been by brute force. So I added it to the ideas list thinking it'd be a good piece of advice to share. When replicating the "problem" for the video, I realised that of course Oase had thought of this! Such a waste of an afternoons video making...... You could have used my moody cinematic shots of the filter for your video, they'll never see the light of day now! 😂 Anyway, great video, great filter! Cheers.

As a matter of fact, have you been able to measure the electrical consumption of the filter and if it is close to the electrical consumption indicated by the manufacturer? Thank you. All the best.

MJ I used to also have an Oase Bio Master Thermal and I also suffered from issues with noise, I actually remember speaking to you about it at the time in comments when you first got yours, and telling you how mine was not making any noise at all, that mine the biomaster 350 was actually in my bedroom and not inside a cabinet, yet was so quiet sometimes I would have to check it was still working, however it did not last long and like a lot of others I'd found after turning off the filter for cleaning the filter would be hell to listen too! Which had only gotten worse after having my ears professionally cleaned! I realised the bio master wasn't at all as quiet as I'd initially thought & in fact it was so loud after that it really had to go. Since then I've been using my back up filter an internal Fluval U3. My question is you replaced yours with another external filter which looks gorgeous but what is it actually like with the DB levels is it quite enough for a bedroom outside of a cupboard? Or do you know or anyone else who's reading this comment happens to know of a good external (not necessarily with a built in heater) filter I could replace my temporary Fluval with? My aquarium is 90*40*45cm approx 90lit I'd want something with a 10x capacity turn over so something equivalent to the biomaster 350.

Hi there, you are doing great videos! I had same problem “ burping “ with different canister filter. Try to tilt slightly the filter when it’s running to all directions. That way will release all air that is trapped In different places.I am doing it every time when I need to clean up the filter as I am getting air farts in the tank! Did work for me hopefully will work for you as well:) Let me know if you try it

You should have measured the flow when the output was on the same level as your aquarium water line...with this setup, even when unpowered you would get a considerable water flow. You can also raise the flow by raising the height of the filter, however impractical that might be. Now what i would want to see is more information on that co2 reactor ;p

hi bro! is it fine to use oase 850 with my 60p ada tank?

I have the 600, was concerned about the flow, fully cleaned all the hoses and greased the 'O' rings, the output went back to full flow, so maintenance!!

I suspect that burping is often due to poor seal. But since the pump creates a negative pressure in the filter housing (sucks), instead of a leak you basically suck air into the filter. Properly cleaning and lubricating the seals often helps.

What sensor/app are you using to monitor temperature?

I have the 600 and it’s good but it came with a faulty heater that overheats my water no matter what temperature it is set to. I contacted Oase and so far haven’t received a response in over a week.

Im using the filtosmart 100 with heater bit IT takes hours to warm up te tank.. does anybody have te same problem?

What is the dope app u use called and how does it work?

So is the flow higher than fluval FX4 & FX6 ?

Hey man. if you want more flow in your filter (like insanely more flow) drill some extra holes in the pre-filter plastic tube. I have the 350 one and increased the flow up to 50% by doing that. Cheers! :)

Hello What kind of co2 reactor is this?

Thanks for the video. What CO2 reactor do you use for 16/22?

I was using fluval 207 and it was burping all the time, just like your biomaster. Now I'm using Aquael Ultramax 1500 for the past 2 years and I never ever heard a single burp. Even though I have it connected between sunsun hw-603 prefilter and CO2 reactor. In fact that filter is so silent that when I shut the cabinet I cannot hear a thing, even at night.

Great video, I confirm have the same pb of burping on this 850…. Even after many months of use… Unaccepetable for the price tag… I change it to a Eheim. Do you think Oase can refund ?

Hi, with a actual flow rate of 600l per hour it could used for tanks less than 200l per hour, better to go for fluvale fx6

Best of the Best...

I have an Eheim 350 that has never gave me any trouble or anything but it is a bit on the small size for my needs. I have some messy Discus in a planted tank. I am thinking of either an Oase Biomaster 600 or an Eheim 600. Seeing all the burping issues all over the internet I'm to concerned about the Oase after owning the Eheim 350 that has never had any issues. But on the other hand I cant see any english review about the Eheim 5e series.. It is like they are not being sold that much.

Seems like the measured flow rate is similar between all models. Would be tough to justify the expense of an 850 vs a 350 or 600 based on that.

I use tropica as my soil and fluval grow plus as my fert and keep my lights on 8 hours a day..but my plants that are bacopa car,rotala,alternanthera reinicki mini satrogyne and moses dont grow well and die out..do uk why?

Yes they look great quality filters as I have never owned one, but I couldn't put up with the noise and spurting, I use and swear by the jbl cristal profi range, there well made, very quiet, a no nonsense filter,and good value, it takes 20mins to clean a filter once every 2-3 months. No bother to me.

The filter might had help in the flow test from the siphon power because the tank water was higher than the bucket...

Hi MJ, I am one of your channel's subscriber and a regular viewer of your videos' content which are helpful to aquarium hobbyists. Thank you for all those useful info. Could you please test thse kind of tests on your other canister filters too, please. I would like to know about Eheim brand's canister Thermo filters too. It will be helpful to many of your followers. Please consider this my request. Thank you, MJ.

Nice demonstration, thanks