Gravity Fed Systems..

Design Drawings for plumbing

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For More Filter Sizes:

Aquadyne AD 2000

.Up to 2,000 Gallons

Aquadyne AD 4000

Up to 4,000 Gallons

Aquadyne AD 8000.

Up to 8,000 Gallons

Aquadyne AD 8000 BHE

Up to 8,000Gallons

Aquadyne AD 16000

Up to 16,000 Gallons

Aquadyne AD 30000

Up to 30,000 Gallons

Reviews on the Aquadyne Filter and Comparison to other Filters.

Aquadyne filtration systems have been produced and sold worldwide since 2001.  

What is a warranty


Many times in a competitive market, producers of products try to make it seem that their warranty and guarantees will cover every conceivable issue that could possibly be associated with a product and that their warranty is better than anyones.

 However when it comes time to submit a warranty claim, all of a sudden issues may not covered because of a "technicality".  While technicalities may play a role in the state of a warranty claim, a warranty typically represents that the goods or services of a supplier must reasonably conform to the buyers expectations.  

In a nutshell, when a consumer purchases products or services, they should expect them to operate as represented.  If a consumer should have concern over any product that is not operating properly, they should seek the advice and remedy from a professional associated with the product as to why the product may not be functioning as represented in promotional and instructional documentation.

 Aquadyne filtration systems have been produced and sold worldwide since 2001.  The Aquadyne product is in both consumer and professional use over a very broad spectrum of both mammal and cold blooded specie habitats with installations ranging from the backyard consumer to public zoo's and aquariums and state and federal wildlife research laboratories, as well as many other installations too numerous to detail.

So what should be realistically expected in a warranty?   As basically mentioned above.  The goods or services of a supplier must reasonably conform to the buyers expectations.


Can there be circumstances or environmental elements that are beyond the supplier control.  Absolutely.  Biological filtration units are living environments and while most balanced environments are similar, no two environments are exactly the same.  

While equipment may be perfectly functional, an aquatic environment may need to be adjusted to assure a healthy biological environment for its inhabitants. In the end a consumer should be able to rely on a manufacturers product and its historical success to mechanically perform, and the manufacturer should be available to assist the consumer after the sale with the knowledge resource for the maintenance and servicability of a product long into the future. 



Dr Erik Johnson - The search for the perfect bead filtration system - The Aquadyne
Forced Air Bead Cleansing Systems - Standard Equipment on Models - 1.1B and 2.2B
Boosts Total Biological Filtration Capacity Approximately 30%
The Dyna~max forced air cleansisng allows thorough washing of bead media through a significant increase in turbulence of media prior to backwashing. The forced air washing, completely breaks up the entire media bed and frees all fine materials that may otherwise remain suspended in the media for further biodegrading.
Reduces the Water Necessary to Backwash by as much as 80%
During a normal non air-assisted backwash cycle, the Model 4.4 would typically require between 200 and 300 gallons of water to effectively clean the filter of waste. With the Dyna~max system you can backwash the same filter with as little as 60 gallons of water. This is most desirable for those wishing to install a larger filter on a pond of a lesser volume than the filter is rated for, because very little make-up water has to be added to the pond after a backwash cycle and a much larger fish load can be maintained in a smaller environment, while greatly entending the time between backwashing.
The Maximum Pond Size shown indicates the maximum pond size for greatest biological effeciency of a given system. Pond size can also be significantly smaller than the maximum rating. By using a larger system on a smaller pond, you will only further increase the biological cleanliness of the pond environment. Likewise, the pond could also be slightly larger than the rating on a system provided that there was not a significant fish load.

  • The Aquadyne Pressure Bead Filter from Cascade…Full 6" Tank Opening
  • The Aquadyne Pressure Bead Filter from Cascade…Dry Hands Cleaning
  • The Aquadyne Pressure Bead Filter from Cascade…No Internal Elbows
  • The Aquadyne Pressure Bead Filter from Cascade…No Flow Restrictions
  • The Aquadyne Pressure Bead Filter from Cascade…No Weak Spin Welding
  • The Aquadyne Pressure Bead Filter from Cascade…Complete Medical Bypass

The Minimum Flow Rates indicated in the chart indicate the minimum flow rates required to backwash or advanced backwash the system. Flow rates during the normal filter cycle can be significantly slower than indicated in the chart. However, during the backwash cycle, you must have the ability to increase the flow to the minimum rating for a proper backwash. Often the use of a two speed pump will allow you to run a very slow flow rate with a lower power consumption while filtering, and only use the less economical high speed for backwashing. The maximum flow rates listed are a cross section of two factors. Mechanical control head port size for effecient flow without significant restriction, and contaminated water contact exposure to the billions of beneficial bacteria residing within the filter. Without a doubt, slower flow during the filter cycle is better, but, a faster flow rate also places the recirculating water in contact with the media more frequently, netting near identical nitrification results.
The Maximum Pressure Rating all Aquadyne systems is a whopping 50 PSI ! --- We actually consider this a non issue, because the Central Diffuser Column on our filter is so effecient and non-restrictive that you would have to install a 5HP pump and have the filter half clogged to put 50PSI on the tank. This simply would not occur in any practical application so we consider it just a perk. However, you should install a water pump that most nearly matches the performance rating of the filter that you are choosing. As a caution, there have been instances where a pump was arbitrarily chosen because of head pressure without the consideration of water volume. This can potentially cause a tank gasket to blow out. For example, if you were choosing a Model 2.2 or 2.2B, the recommended water flow rate for maximum filtration effeciency is between 1000 and 4000 gallons per hour. That is not to say that the filter would not perform well at 5000 gph. BUT, what some contractors tend to do is use high head swimming pool pumps on fish ponds because they are cheaper to install. The basic deal is that the average 1Hp swimming pool pump can pump about 5000 to 7000 gallons per hour, which is not the real problem. The real problem is that when a filter begins to load up with fish waste and debris this swimming pool pump with its high head impeller tries to maintain this high rate of water flow which in turn can put excessive pressures on a filter tank which can cause gaskets to leak. High head swimming pool pumps also cause other problems as well, but we will discuss this later. As always, we are available to answerany confusions that you may have when making an equipment choice.

  • The Aquadyne Pressure Bead Filter from Cascade…Full Rinse Cycle
  • The Aquadyne Pressure Bead Filter from Cascade…Full Media Access
  • The Aquadyne Pressure Bead Filter from Cascade…Advanced Backwashing
  • The Aquadyne Pressure Bead Filter from Cascade…Internal Sedimentation
  • The Aquadyne Pressure Bead Filter from Cascade…One Touch Operation
  • The Aquadyne Pressure Bead Filter from Cascade…5 Minute Weekly Cleaning

On The Other Hand you should be aware that some filter manufacturers use a technique called spin welding to attach fittings to their tanks, and thin tank wall construction, these tanks can only be rated at pressures of around 15 PSI Max. This is not sufficient for medium head pumps capable of any decent flow rate. We do not use these substandard manufacturing practices.

Dr. Johnson


Aquadyne Experience

An article by Rick Kitner that appeard in the KOI CARP magazine in June 2004.


There are many different filters currently on the market, onefilter that is new to the UK but not new in its own right is theAquadyne. Amazingly the Aquadyne filter system that is currently causing quite a stir in the UK, has been around for nearly a decade and therefore is far from being a new pieceof equipment. It is in fact quite the opposite; it’s tried and tested worldwide.

The Aquadyne filter originated in the United States and was invented by a man called Greg Crane. With a background in Fluid Hydraulics Greg was a hobbyist who found the existing units to be very good initially but had serious long term clogging problems. He felt that there must be a better way. Eventually with the aid of research data supplied by Louisiana State University Sea Grant Program and many hours spent creating mock ups, scale models and prototypes the Aquadyne was finally born.

The one problem that he felt was essential to address was the problem of clogging due to convoluted and in many cases inaccessible pipework. It was these internal configurations that caused 99% of all the breakdowns that he had experienced. At the heart of the design was an ingenious central column that ran down the middle of the compact circular vessel that formed the body of the filter. It would be this piece of equipment that would supply and remove the water to the filter. All the control gear needed to backwash and clean the filter was attached to the top of this column thereby moving the internal mechanisms that had been designed within it. The internals were such a revolutionary design that a worldwide patent was immediately applied for, as everygood design needs to be protected.

Every filter should deliver clear and clean water. The Aquadyne did this but went beyond this simple remit. The water clarity produced by the Aquadyne was outstanding. Clarity of water is normally measured in how large the particles present within it are and these are known as microns. For example water containing particulate size ofsay 500 microns would basically have many large visible particles with sizes ranging from 1 to 500 microns. Water with 10 microns would only have almost invisible and tiny particles of up to 10 microns present. Therefore the bigger the micron size the cloudier the water. The Aquadyne had delivered an average micron size of below 50 and often a slow as 10. In real terms 10 micron clarity is clearer than many peoples tap water! This superb clarity was created by tightly packing the media within the filter resulting a slightly pressurized system which meant the water was forced through the mass of very fine silicon beads therefore effectively creating a simple but extremely effective 10 micron filter. The beads in question being so small around 3-4mm had, and still have, the highest surface area of any filter media. One cubic foot contains around 600,000 beads giving a huge surface area of over 400 square feet. In metric terms this converts to1,300 square meters of surface area per cubic meter nearly double that of any other plastic media and higher than many natural type medias.

With regards to clean water, once again the Aquadyne excelled due to its design, the filter had the ability to handle fantastically fast flow rates. On the larger models flow rates of over 6,000 gallons per hour were easily maintainable. The advantage of this was quite simple, the quicker the toxins i.e. ammonia and nitrite were removed from the pond, the better. Up until this point the benchmark figure of turning a pond over was every two hours as this was the best balance between speed of toxin removal and slowness of flow foro optimum mechanical settlement. It was not the ideal flow rate as filtering the pond only twelve times a day was way behind even the slowest basic goldfish aquarium, but it was the multi bay systems being used at the time that dictated this turnover rate. They could not handle the faster flows as it resulted in extremely cloudy water. Basically if the water was pumped at high speeds through these filters it would enter dirty and cloudy, be swirled around in each chamber and then pumped back into the pond biologically clean (i.e.no nitrite or ammonia) but still cloudy. To cope with a fast flow rate to achieve optimum biological filtration the filter would have to be huge, to enable efficient mechanical filtration. In real terms around the same size as the pond! With an Aquadyne filter suitable for a 12,000 gallon pond measuring only 1.15 Meters tall by 0.75 Metres wide, this was a massive improvement. One added benefit unexpectedly discovered was that the strong currents now present in the ponds were extremely beneficial in maintaining and developing strong muscle tone and therefore good body shape. Confirmation of this is that many Japanese breeders now add extra pumps to their ponds purely to create these beneficial currents. Seeing as the two main criteria were easily achieved, the only question the Aquadyne had to answer was ‘how easy is it to clean?’ The answer was simple ‘very easy’!

When the internal part of the Aquadyne was designed the whole issue of simple maintenance was just as important to its creator, as the water quality it produced. After all who wants to spend time getting wet and dirty stripping down and washing out filters all the time? The way in which simple cleaning was achieved was to utilize the power that the high flow rate pumps made available. A large powerful 1.5 HP air blower was fitted, to blow vast amounts of air into the mass of floating media thereby loosening the tightly packed beads and dislodging the trapped particulate at the same time. Then a simple turn on the handle of the control gear and the flick of a switch followed by a wait if approximately two minutes while the media is washed by the main pond pump and job done! Not even the remotest chance of getting wet or dirty. To back the system up further and to make everything easier, a pressure gauge was fitted to the external control gear mounted on top of the central column. This was added to give a visual indicator of how dirty the filter was. As the particulate is trapped in the filter the pressure increases thereby giving warning that cleaning is necessary. One final addition was the introduction of a sight glass on the waste side of the control gear for visual confirmation that the cleaning process is successful. The principle of biological filtration is quite simple, pass oxygenated water over media, whether it is Japanese matting, plastic media or gravel, bacteria will form and a filter bed will be established. All filters have to use this process. It is only the issue of how efficiently the filter does this and its ability to mechanically filter the water whilst doing so, where filters can differ greatly. Even though the Aquadyne filter has been around for a number years and many thousands are now in use, it has not changed.

This is proof positive that the combination of Greg Cranes background in the Fluid Hydraulics field and his knowledge of Koi keeping, contributed hugely to the success of the filter. More than 10,000 Aquadynes have been sold around the world since its conception and amazingly only one Filter has ever been returned. With results like that and 5 star ratings from everyone that owns one, it is hardly surprising that the Aquadyne filter is making such a big impact in the UK.

England, KoiBitz Review: http://www.koibitz.com/Scripts/prodView.asp?idproduct=153

Art Hungerford July 11, 2012

have a I Koi pond (about 800 gallons) and I think this Aquadyne 2.2 BHE is sized perfectly for 800 - 1,000 gallons with about a dozen medium sized koi. I use it along with a double (parallel) UV clarifier at 25 watts each. Before the weather got really hot (over 95 degrees), I could backwash every two weeks. But now with the record heat, I notice the water gets a little cloudy after about 7 - 10 days, so I just backwash every week now. As long as I do this, the water is amazingly crystal clear. Be sure to get the blower!! It makes backwashing so easy (be sure to carefully read the instructions on backwashing as it's not entirely intuitive). Glad I finally bit the bullet and got this product.

Hiroko K. December 16,2013

I bought a Delta Ep-5 UV light, Aquadyne 4000 Bead Filter, and Performance Pro Artesia 2 1/4 HP pump from Aquadyne. Greg is the absolute best! They were really helpful with installation, and this setup is absolutely amazing! My koi pond has about 3000 gallons, and it is just beautiful.
This system works great.

we also have 2 aquadyne 1b and a 2b meaning b is w/blower.. for our 1200 gal pond and our 2600 gal. ponds and really like them.. we also keep a boi filter along with the aquadyne on the 1200 due to a large amount of koi.. we are going to redo that pond this spring..they are very easy to clean..

Senior Member
Join Date Dec 2006
Location NC
Posts 1,583
I have a aquadyne 8.8 it has a blower,i like it.

I would still recomend pre-filtration with the bead thoug
h Norm

Hans Bender

Senior Member
Join DateJun 2009
Location new england
Posts 104
i got aquadyne 4.4 with blower. backwash once every 2 weeks. water is crystal clearhttp://www.koiphen.com/forums/images/smilies/wink.gif

02-27-2010 #13
JMorris271's Avatar
Senior Member
Join Date,Jun 2006

Location,Columbia, SC

I use 2 Aquadyne 2.2 BHE filters.
The blower makes cleaning them a snap. Usiing a vortex filter before each bead. I have 14 koi in a 5K pond. No problems at all. The pond is gin clear.
Just be sure to get a high head pump to overcome the head. No snail problems here.


Aquadyne(C)   Bead Filtration Systems Warranty:
*  Aquadyne offers a fair trade repair or replacement warranty on all models of the Aquadyne Bead Filtration Systems to the original purchaser.
*The warranty covers the main tank, control head, and central diffuser column.
 If the main tank, control head, or central diffuser column becomes inoperable due to manufacturer defects, we will repair or replace the broken piece or pieces "at our discretion" for a period of 5 years.
* Rubber O-rings and seals are warranted for a period of 2 years.
*This warranty does not include damage from dropping and breaking components, freezing, misuse, over-pressurization, or subjecting threaded connections to load bearing stresses, or damages due to over tightening threaded connections or use of non plastic approved thread sealants.
* As a courtesy, any damage determined to be the result of such action that is not warrantable will be available at a reduced cost. (oem#114)
Best Regards,
Greg Crane




Aquadyne Filter has the same outer working with the Air Release Valve same as Challenger Filter
The Internal Workings of the Aquadyne Filter is Very Different...
Greg has made it so the:

 water circulates more effectively in the top and bottom.



Notice down by the Sludge drain the circulation is keeping the sludge out put more Clear [B]

Advantage Filter
Challenger Filter
Aquadyne Filters
Pressure Guage
Site Glass
Clear Plastic Lid
Air Release on Lid
Sludge Drain at Bottom of Filter
Water Flow Directed right at the Sluge Drain inside of filter to break up sludge so it can flow right out filter when back washing.
Internal Plumbing with Non Restrictive Flow
Multi Port Valve
Handles Low Flow rates easily
Blower for Back Washing
Cable of consuming large amounts of waste..Neutralizing equally large amounts of ammonia and nitrites, separting and back washing hughe amounts of solid particulates waste with out clogging.
Ball Valve on the Blower Arm
Swing Check Valve on Arm of Blower
2" Plumbing
Reviews On Filters   Challenger Aquadyne