What Are the Common Problems Associated With a Tankless Filter System?

Imagine reaching for a cool glass of water and finding out that it’s just not happening today with your trusty undersink tankless filter system. Slow flow, bad taste, and unexpected leaks are enough to cause serious concern. No worries though, TanklessFilter, your specialist in water treatment in NYC, is here to help. Explore below some common problems your filter system may have and how to resolve them.

Understanding Common Issues of Your NYC Tankless Filter System

Although systems that use tankless filters are the most convenient and effective way to ensure purified drinking water, yet, you may face some typical problems, as with any other device. Let us discuss shortly some common basic issues related to the system.

Low Water Pressure

Are you getting a lower flow through the unit than you usually do? Most probably, the prefilters or the RO membrane are blocked. Prefilters only collect sediment, dirt, and other particles that can, over time, block the RO membrane. A huge portion of the water flow can be impeded if prefilters are overloaded. The RO membrane too, over time, can become blocked by the accumulated contaminants in your water source. Accumulated sediments in your pipes could also be responsible for the pressure drop. A malfunctioning pressure regulator may cause inadequate pressure in the home’s plumbing system and could cause low pressure in the tankless filter.

Foul Odor or Taste in Water

If your filtered water is not pleasant to the taste or has a bad odor, the cause might be an excess of organic material in your drinking water. Other causes are chlorine residuals remaining from disinfection at municipal drinking water treatment facilities, not to mention filters not working. Even worse is the possibility of bacterial contamination.

Potentially growing bacteria due to either source water contamination or poor disinfection inside the system doesn’t just cause foul water odor or taste, they could be harmful to the health of humans. Deteriorating media in the system, such as activated carbon that has adsorbed many contaminants, might be another cause of off-tastes and odors.

Water Leaks

A leak from your tankless filter system can be very worrying. Loose or damaged connections are among the most common reasons for leaks in a tankless filter system. These connections get slack because of vibration or some other factors. If tightening the connections does not stop the leak, they may have been damaged; replace them.

The other major problem is worn-out gaskets or seals. Gaskets and seals are supposed to make watertight connections between the different parts of the system. In general, they undergo an aging process, wherein they can degrade over time and lose their sealing capabilities, causing water leakages. Finally, what is not very common but still causes leaks is cracks in pipes or tanks. That can result from inappropriate installation procedures, very high water pressure, or freezing. 

Sediment or Discoloration in Water 

Improper water pre-treatment is hugely responsible for this. If your incoming water is high in sediments like sand, rust, or various particles, it can load the prefilters on your tankless system to the point that it lets some through and into the water going to the RO membrane. This will mean that the tankless filter will do less pre-filtration, resulting in unhealthy filtrate. Sediment or discoloration may also result from aging or failing filter media within the tankless system. Over time, all these filters and other tagging media become more saturated with contaminants, diminishing in their ability to take out impurities well.

Regular replacement of filters, according to the manufacturer’s recommendation, ensures your water filtration system works best and prevents sediments from entering your filtered water. Finally, other likely suspects are corroded pipes or tanks in the system. The corrosion of pipes and tanks can occur because of hard water, acidity in water, or even poor installation material. This corrosion of pipes and tanks will release rust or any other pollutant in your filtered water, leading to discoloration. 

Filter Clogging

As time passes, many fine particles are deposited on the filters, causing a dramatic loss of water flow. Many of the water pipes and channels that today serve residents in New York were laid many decades ago, with little or no maintenance over the years. In addition, inappropriate water treatment is sometimes carried out at the municipal supply. In such cases, the sand or rust would certainly overwhelm the filters in your RO system.

An investment in a pre-filtration system, such as a sediment water filter or a whole-house water filter, considerably reduces the volume of sediment that will reach your tankless system. This will mitigate clogging and interference with your system’s functions. The other rarer issue is a high flow rate. It pushes some contaminants through the pre-filters before they get a chance to be properly trapped. To ensure safety, you can contact us, and we will send our skilled operatives to attend to any percieved problem in this regard.

Scaling or Mineral Buildup

Water that is highly infused with minerals leads to scaling, which eventually causes a mineral build-up inside your tankless filter system. These minerals clog holes, reduce the life span, and affect the general performance of your system. This problem could also be caused by ineffective water softening, although all our undersink RO systems handle this sufficiently.

In any case, you would be best advised to consider having the water supply for your entire home softened. Whole-house water softening treats hard water throughout your plumbing system, so you are never troubled by sludge buildup in your tankless filter or any other part of your appliances and pipes.

Regulate the water temperature as much as possible because hot water dissolves minerals easily, and once the water goes into a holding tank after passing through your tankless system and starts to cool down, the minerals as mentioned above precipitate and form scale. Lower the settings of your water heater if you can. This small tweak may be mildly noticeable, but it will help a lot in the overall improvement of the lifespan and efficiency of your tankless filter.

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The Importance of Professional Servicing and When to Seek Help

Although some basic troubleshooting can be done on your own in some cases, professional assistance must be sought in certain other cases. With our experienced technicians, You can have the following sorted: 

  • Complex Leak Diagnosis and Repair: On a tankless filter system, leak diagnosis and repair can be quite complex. Our technicians are well-trained to determine the leak’s origin and conduct repairs that will hold up permanently.
  • Replacing the RO Membrane: The RO membrane is the most vital part of your tankless filter system. As such, replacement requires special knowledge and techniques. Technicians from TanklessFilter can guarantee proper replacement so that the system gives its full performance. 
  • Solving System-Specific Problems: Some tankless filters may have specific issues that need targeted repair. Our experienced technicians have expertise in repairing various systems and can provide a targeted solution. 

Don’t Let Tankless Filter Issues Disrupt Your NYC Home’s Water Supply

At TanklessFilter, we understand the importance of having a reliable water filtration system for pure drinking water in your NYC home. Our team will present you with solutions to fix any problem when troubleshooting your tankless filter system and maintaining it in perfect working condition. Contact us today to schedule a service call or consultation.

Frequently Asked Questions
What are the pros and cons of tankless filters?

Pros of a tankless filter:

  • it takes more space
  • modern design
  • has a built-in leak detector
  • showing when it’s time for service
  • less water waste


  • depends on electricity


Does tankless RO filters remove PFOA/PFOS?

Tankless reverse osmosis (RO) systems are designed to remove a wide range of contaminants from water, including PFOA (perfluorooctanoic acid) and PFOS (perfluorooctanesulfonic acid). PFOA and PFOS are a type of per- and polyfluoroalkyl substances (PFAS) that are commonly found in water supplies. RO systems use a semi-permeable membrane that can effectively remove these harmful substances, along with many other impurities, such as heavy metals, chlorine, and various chemicals.

How often filters need to be changed?

For households below 6 persons service once a year is enough.

What gives better water quality tank RO or tankless?

They are equal.

Can I connect my RO system to a fridge/chiller/heater?

Yes, we can provide this service

I heard NYC water is good. Why do I need a filter?

NYC water is good by itself, however, NYC pipes are very old and made of lead and copper. So major water contaminants of NYC are chlorine, lead, copper and also a high level of sediment.

A separate water problem is PFOS/PFOA, it’s a new contaminant that may cause cancer and RO filtration is the most effective way to remove it.

Do you have a warranty on your systems?

Yes, all our tankless filters have a 3-year warranty.