This FAQ page was developed to give insight and answers to the most common troubleshooting questions asked by people who are cycling their new Aquaripure denitrator.  There are really only a few specific situations that occasionally arise in relation to a new denitrator.  These situations only occur some of the time, are usually caused by specific circumstances and have fairly simple solutions.

My Aquaripure was working great but I think something happened that killed off the bacteria in the denitrator.  How do I get it working again?

Occasionally something can disrupt the bacteria in the denitrator such as the use of antibiotics in the tank or maybe switching to a different aquarium.  If you feel the bacteria in the denitrator have been "killed off" or disrupted then don't worry.  It will get back to normal but it might take another month or so.  To speed up the process you can inject nutrient then close off the valve completely for a couple of days.  You can also inject nutrient every four days for a while.  Once it is cycled you can just resume the feeding and adjustments as you normally would.

The flow rate of my denitrator fluctuates excessively and even completely stops at times.

This can actually be a good sign.  It generally means that the Aquaripure is beginning to work.  Some fluctuation is inevitable and normal.  When the Aquaripure is fed it creates a bacterial bloom within the filter.  The billions of bacteria create resistance to the water flow but this is also what cleans the water and removes nitrates. 

If you are following the directions to adjust the denitrator correctly it should always be able to get a strong flow when the flow valve is wide open.  It is important to open the flow valve completely and then immediately decrease the flow to the correct rate each time you adjust it (every 2-3 days.)  Bacteria can build up in the narrow tubing and this will clear out the tubing and valve of any bacterial build up.  It will also let you accurately gauge the flow since when you check the flow rate the end of the outflow tube may be partially empty giving the appearance that the flow rate is less than it actually is.  If the outflow has completely stopped even when the flow control valve is wide open then the outflow tubing and flow valve needs to be cleaned.  Simply unscrew the outflow tubing and flow control valve and rinse it in hot water and blow on it until it is cleared.  If that still doesn't clear it you can take a wire coat hanger and push it down into the outflow hole of the filter itself a few inches.  Just make sure to do this to the outflow only and not the inflow.  Also be careful not to lose any of the little pieces when you unscrew the outflow tube. 

Also note that the pump provided with the denitrator will not provide enough power to pump water from a sump tank, through the denitrator, and into the main tank.  If the pump is placed in the sump then the outflow must be placed in the sump. 

It has been over eight weeks and my denitrator has still not cycled.     

Aquaripure's filters are now pre-populated with more live bacteria culture than ever to ensure it cycles as fast as possible.  However, it can still sometimes take up to 10 weeks to really notice a difference.  Denitrators can be less efficient in aquariums with a lot of biological filtration such as a large wet/dry filter combined with a skimmer and a lot of live rock.  Basically, the water entering the denitrator is high in nitrates but very low in organic matter.  In some extreme cases the denitrator can have difficulty cycling. 

The Aquaripure is a comprehensive biological filter.  Other biological filtration can interfere with the function of the Aquaripure if it is excessive.  The denitrator needs to break down some of the organic matter so that it can use up the oxygen in the denitrator and produce the anaerobic bacteria that then break down the nitrates.   You will need to get rid of excess biological filtration when you install the Aquaripure.  For example, get rid of almost all of the bio-balls in a wet/dry and only leave enough to aerate the water.  If you have a powerful protein skimmer reduce the skimming action so less organic material is removed by the skimmer.  Don't worry! The Aquaripure will pick up the slack.  This will insure the anaerobic zone in the Aquaripure remains established.

You can also reduce the rate of the outflow by about 25% or so.  This will also help insure the anaerobic zone remains established.   For increased performance of the denitrator in these systems you can also feed the denitrator as often as every four days and adjust the flow control valve up to every two days.  Please see Aquaripure's Advanced Aquarium Tips for more info.  The vast majority of users will achieve a complete reduction of nitrates using the instructions provided.

After I feed the denitrator there is a slight cloudiness in my tank. 

Occasionally some of the bacteria from the denitrator can escape into the tank causing a slight cloudiness.  It should disappear on its own in a day or two but if it is severe then a water change is recommended.  Reduce the amount of nutrient injected by about 25% and slightly reduce the water flow as needed to eliminate this problem.  Once the Aquaripure cycles and nitrates reach zero this effect will be minimized and you can try increasing the flow rate and nutrients.  This usually only happens when the Aquaripure is slightly oversized for the aquarium.

The effluent of the denitrator smells.

This can also sometimes happen with an oversized Aquaripure.  It can be normal for a denitrator to have a slight rotten egg smell occasionally but it should only be noticeable if you put your nose right up to the tube.  Let me explain what has happened and then I will explain the solution.   

When the anaerobic bacteria run out of nitrates they will begin to break down the sulfates in the water. Sulfates don't really harm anything at all so no one is concerned about them very much. When the bacteria break down sulfates it produces Hydrogen Sulfide gas. Hydrogen Sulfide gas is not very soluble in water and so does not build up in the water in an aquarium unless there is no water flow or aeration at all and it will escape into the atmosphere. The human nose is extremely sensitive to hydrogen sulfide which has that distinctive odor. A person can smell it at concentrations as low as 20 parts per billion.  

Summary

Aquaripure's denitrators cycle without incident the majority of the time.  Fluctuation in the flow rate is normal and necessary when the denitrator initially cycles.  If the water flow is stopped when you go to feed you can clean the flow control valve and then adjust the flow valve as directed to prevent recurrences.  If you notice an excessive smell coming from the denitrator then you should actually increase the flow rate by about 25% (not decrease), reduce the amount of nutrient injected by 25% and trickle the outflow through carbon if necessary.  If your aquarium has nitrates but little or no organic matter in the tank then the denitrator may not be as efficient.  Eliminate the other biological filtration in the aquarium, lower the flow rate by about 25%, and inject nutrients up to every four days.  If you notice any cloudiness in the tank just lower the amount of nutrient injected and the flow rate by about 25%.  

For all other questions just contact:

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Extra Tips:

-The Aquaripure can also be fed the recommended amount of nutrient up to every four days although once a week is sufficient in most aquariums.

-A partial water change every three or four months and the use of phosphate remover is recommended to keep trace elements and phosphate at optimal levels.

-The use of carbon or synthetic adsorbent is also recommended to polish the water.  

-Monitor pH levels and when pH levels are low use baking soda to increase it.  

-When you add water to your tank lost due to evaporation use a distilled or purified water or at the least use a water conditioner.