Aquatic Life RO Buddie 4-Stage Reverse Osmosis Deionization Water Filter System RO/DI Filtration Units for Aquarium, 50 GPD
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Availability:
In Stock.
Arrives
Sunday, Mar 15
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Size: 50-Gallon Four stage
Features
- SUPERIOR WATER QUALITY: This Aquatic Life RO Buddie is a 4-Stage RO reverse osmosis system. Produce up to 50 gallons of filtered water per day with this 50 GPD RO reverse osmosis filter. This ro/di filter system for making aquarium water provides optimal filtration for your aquatic environment.
- MEMBRANE FILTRATION: The RO membrane filter in the reverse osmosis water filtration system reduces Total Dissolved Solids (TDS) from the water down to the ratio of 1 out of 10,000.
- EFFECTIVE SEDIMENT REMOVAL: The sediment filter in the RO water filtration system captures sand, silt, and more, which affect the quality and appearance of water.
- CARBON BLOCK FILTER: The carbon block filter in the RO water system eliminates chlorine and conditions water before it reaches the RO membrane.
- COLOR-CHANGING DEIONIZATION FILTER: The mixed bed deionizing resin in the RO reverse osmosis water filter employs Cation and Anion beads to remove any remaining TDS from the membrane-filtered water.
Brand: Aquatic Life
Special Feature: Compact, Portable
Product Dimensions: 13.75"L x 7.5"W x 6"H
Material: Sediment, Carbon, RO Membrane, DI Resin
Capacity: 50 Gallons
Included Components: RO Buddie Four Stage Reverse Osmosis System Cartridge
Package Information: Cartridges
Installation Type: Wall Mount
Purification Method: Deionization
Power Source: Manual
Is Discontinued By Manufacturer : No
Product Dimensions : 13.75 x 7.5 x 6 inches; 3.9 Pounds
Item model number : 540019
Department : all ages, unisex
Date First Available : August 19, 2004
Manufacturer : Aquatic Life LLC
Best Sellers Rank: #6,557 in Pet Supplies (See Top 100 in Pet Supplies) #13 in Aquarium Filters
#13 in Aquarium Filters:
Customer Reviews: 4.4 4.4 out of 5 stars (6,375)
Brand: Aquatic Life
Special Feature: Compact, Portable
Product Dimensions: 13.75"L x 7.5"W x 6"H
Package Information: Cartridges
Installation Type: Wall Mount
Power Source: Manual
Item Weight: 3.9 Pounds
Model Name: 540019
Maximum Flow Rate: 180 Liters Per Day
Upper Temperature Rating: 105 Degrees Fahrenheit
UPC: 810957010195
Global Trade Identification Number: 95
Manufacturer: Aquatic Life LLC
Item Weight: 3.9 pounds
Department: all ages, unisex
Item model number: 540019
Date First Available: August 19, 2004
Item Package Dimensions L x W x H: 16.02 x 10.24 x 5.39 inches
Item Dimensions LxWxH: 13.75 x 7.5 x 6 inches
Brand Name: Aquatic Life
Target Audience Keyword: fish
Warranty Description: 1-Year Limited
Color: White
Size: 50-Gallon Four stage
Age Range Description: All Ages
Number of Items: 1
Specific Uses for Product: Active
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Mar 15
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 50-Gallon Four stage
I purchased the RO Buddie 4-stage RO/DI 50 GPD filter. This is for my small freshwater setup which includes seven tanks of varying volumes with a total volume of just under 100 gallons. I went with the RODI and not just RO system because I am trying to decrease the alkalinity of my water. So far so good after filtering 10 gallons of RO/DI water. It's very easy to set up and my water parameters have come out excellent with zero PPM TDS and zero EC (see attached photos, the meter was calibrated today). I live in Coastal Georgia and have moderately soft water parameters from the tap at around 150 PPM TDS (total dissolved solids) with a significant amount of EC (electrical conductivity) due to the high amount of minerals in the water. So basically very low sediment but high mineralization and somewhat moderate GH and KH. I have had a hard time keeping my South American tanks at good parameters for my tetras to breed and this will help immensely if it continues to work as it has so far. A Few Tips: - tighten the deionization filter cap before you install, I had a small leak as mine was somewhat loose but that was easy to fix and find and I just tightened the cap of the actual filter body itself and the leak stopped. To do it correctly I took all the hoses out and tightened it that way so I would not torque the hose connections. - this can be run off of any hose or even many kitchen and bathroom sink setups if you take out the aerator from your faucet. I am personally running it off of my laundry room and it's running beautifully as there is both a supply of cold water and a drain for the wastewater. - if you're going to install it in your laundry room all you need is a t-joint hose splitter or some other sort of double hose splitter that fits the receptacle for your washing machines supply water and gray water drain (see attached photos of my setup, everyone's will vary and I had to measure mine specifically as there are a huge variety of hose splitters) - if you are are doing a laundry room setup like mine where you can mount it close to the washing machine then the amount of hose provided in the kit will be more than sufficient. However if you are doing some other sort of setup you may want to buy additional hose, as you will need not just the proper amount of hose for the treated water but also the appropriate length of hose for wastewater. You could of course use a bucket but if you want to appropriately drain it to a sink or drain, getting additional hose maybe necessary. - if you are using this for a freshwater setup like I am you must absolutely get an additive that will keep the GH and KH at appropriate levels. RODI water by itself will kill fish. - Read the darn instructions. For a cheap system like this they are actually fairly detailed and obviously written by somebody who speaks English fluently. - having a solid set of channel locks or a wrench that will fit into a small area, as well as Teflon tape for the female ends of the threaded connections, will help reduce the potential for leaks. I am on city water that withdraws from a river and and underground aquifer and it is at a fairly high PSI as I live only 2 mi from the treatment center. All in all I am really pleased so far as this is the least expensive system I could find. This would not be an appropriate system for drinking water as the pressure/supply would not be great enough to fill a glass in a reasonable amount of time. Right now I am averaging about 5 gallons of treated water every 90 minutes (around 80 GPD) which is far above the 50 gallons per day that the system rated for, although I expect that to eventually go down as the sediment and carbon filters begin to fill with debris. That said, I am currently probably experiencing closer to a 75 GPD or even 100 GPD system which got $70 is impossible to beat. As an added bonus when the RO finally wears out I can replace it with one of their 75 GPD or 100 GPD rated filters so long as I swap out the The 450cc flow restrictor for an 800cc flow restrictor, thus functionally increasing the output of the system. This will of course wear out the DI filter faster. I will update this review if anything changes but so far I am pleased. For some reason Amazon's AI wants me to comment on the noise level which is silly for a system of this low of a flow rate. If it's making any noise louder than a few gurgles and bubbling sounds that you can only hear when you are right next to it then there is probably something wrong with the system like over pressure or an incorrectly installed hose connection which is creating suction and/or air intrusion somewhere. So, tldr, it doesn't make any noise. In summary, it's a cheap effective system that took me about 20 minutes to install with just the parts in the box and the hose splitter I bought. Hard to go wrong at this price point. I would recommend this to anyone who needs a small amount of water for weekly or bi-weekly water changes and is trying to keep the GH and KH of the water column down (i.e. slightly acidic or neutral). note: The picture system has not been fastened to my wall yet nor have I done any hose management so bear that in mind as well.
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Reviewed in the United States on October 25, 2025 by Diego Marzipan Diego Marzipan
Size: 50-Gallon Four stage
Size & Setup: The Aquatic Life RO Buddie 4-stage RO/DI unit is compact and easy to set up, making it ideal for smaller spaces or hobbyists who don’t need a large permanent system. Performance & Water Quality: Despite its size, it’s very effective, producing clean, high-quality RO/DI water suitable for aquariums and other uses. Maintenance Considerations: Because of the smaller filters, you’ll need to change the cartridges more frequently, depending on your incoming water quality and total gallons processed. Final Verdict: If you want a small, effective RO/DI system, this unit does the job well. Just be aware of the more frequent filter changes due to its compact design.
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Reviewed in the United States on January 2, 2026 by marco Agliano
Size: 100-Gallon Three stage
I dont see why someone could write a bad review on this RO aquatic filter...... it works like a dream, 2:1 wast water, 10 minutes to connect to water supply and mount. What can I say it works like a dream. I use it for a hydroponic setup on a 4×8 flood table with 28 plants in 3 gallon fabric pots it so far it works perfectly... time will tell if it holds up but for the price and performance I'm extremely happy with my purchase... I spent hours looking at all the different RO water filter on Amazon and I finally decided on this one and I'm happy I did. I purchased a float valve separately to have automatic shutoff on my water tank to complete my system. With automatic water feeding and the float valve the system pretty much runs itself. Hope this review helps someone else with there RO water filter decision. If i run into any problem in the future I'll be sure to report back.
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Reviewed in the United States on November 12, 2025 by Gemello
Size: 50-Gallon Four stage
The product is a easy setup and works, the only con for me is that the male/female adapter that screws where the aerator sits is made out of cheap plastic and broke easily on testing the product. Since it was working before trying to remove and breaking i went to buy another.. the only problem with that is they don't sell the cheap plastic piece they sell a metal adapter. Why wouldn't you charge the extra 10 bucks and send your customers the better quality parts so we don't have to worry about getting the m/f adapter out of the faucet? other than that this product is as advertised, a great cost effective RO system for small aquariums and in my case small time growers.
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Reviewed in the United States on August 14, 2025 by Bobby Johnson Bobby Johnson
Size: 75-Gallon Three stage
I bought the 75 GPD kit to make water for my huge humidifier, hoping to reduce or eliminate white dust! First, Aquatic Life customer support is excellent. I had a tech question, called them (number on their website) and Dave called back within 2 hours, very knowledgeable, friendly, helpful. Second this system works really well. Very clear instructions and easy installation too. I ended up installing the the float valve right in the humidifier. (Did I mention, it's huge, 5 gallon reservoir.) It works great. One thing, that Dave alerted me to, is the solenoid can be a little noisy with the float valve. This might disturb sleep overnight. Very simple solution is to shut off the water supply at night. The 1/4" water lines are very easy to work with and it was a simple matter to install a shutoff. The kit includes adapters for a faucet, but I used a saddle valve directly on 1/2" copper pipe.
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Reviewed in the United States on February 4, 2026 by Mike T
Size: 50-Gallon Four stage
This is it!! Saves driving to fish store. 40$ weekly water prices. Hooked mine to shower head. FYI, get the adapters !!! Use shower head (will leak little) or use faucet. If you can find the adapter that fits into those psychotic mythical perfect fits. Once it works. Run it and toss first bucket. Then your rolling. Keep pressure low on water honestly and push those hoses in tighter to stop the leaks on the unit. I put mine in a 5 gal bucket and its bone dry after reapply pressure into all tubing to make it leak proof. Should only leak from connection. As long as its consistent giving you clean water. Your solid. Shower heads have alot of pressure so go for anything you csn regulate
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Reviewed in the United States on January 19, 2026 by Edazzlin dizzle