What's the advantage of the under sink water filter compared to a Reverse Osmosis water system?

Great question!

1. The under sink water filter saves more space than the traditional RO water filter. Plus, it does not require a storage tank.

2. The installation process for Under Sink system is easier than RO system with tank.

3. The water filter for sink does not produce waste water. ALL Reverse Osmosis units produce waste water. With the modern technique, the waster water ratio can be reduced, but not eliminated.

4. The under sink filtration system keeps health minerals in water while removes up to 99% of most problematic pollutants such as chlorine and chlorine treatment by-products, lead, arsenic and much more.

How many gallons of water will be treated during a filter's lifespan, before they need to be replaced? Also, is there a change indicator?

The cartridge set has a capacity of 1100 gallons. However, please be aware that the actual gallon life will vary from customer to customer. As with all replaceable filter cartridges, they have limited space to hold the contaminants they remove from your water. This means that the higher concentration of junk you have in your source water, the faster the filters will run out space to keep filtering and vice versa. The filter lifespan is 6 to 9 months depending on water quality and usage.

Has anyone tested the water that comes out of the filter with a TDS meter? I checked mine today and found that the TDS was the same as the tap water.

This under sink water filtration system is not designed to remove TDS. Instead, it keeps healthy minerals in your water. If you are insterested in removing TDS, we recommend to consider a Reverse Osmosis water filter, like RCC7 & RO500.

Are Total Dissolved Solids (TDS) bad for you?

Total dissolved solids (TDS) is the term used to describe the inorganic salts and small amounts of organic matter present in solution in water. The principal constituents are usually calcium, magnesium, sodium, and potassium cations and carbonate, hydrogencarbonate, chloride, sulfate, and nitrate anions. The lower TDS means the purer water you have. However, it does NOT mean that the lower TDS the better quality the water has. Whether or not TDS are good or bad depends on what type and amount of materials in the water. Some of the minerals are healthy, while some are harmful. If you want to have a better understanding of your water quality, it is recommended to use a water test kit or get your water tested by a third-party company. For more details of how to get your water tested, you can read this article here.

Can I connect existing water line(previously connect to refrigerator,tiny size) to this under sink water filter or I have use a adaptor?

Yes. If you want to use this as a main filtered water supply, you will want to need an adapter depending on the diameter of the tubing. If you have any more questions, please contact us at (678)261-7611 or open a ticket here.

Does this remove flouride?

Unfortunately this unit does not remove fluoride. You will need reverse osmosis in order to remove fluoride.

Follow on to teeing off to icemaker: can the no-pressure faucet be used as non-air gap? if not, can a non air gap faucet be shipped instead?

This system is intended for use with a no-pressure faucet which cannot be used as a non-air gap faucet. In order to use this system with a non-air gap faucet, you would need to install a pressure regulator (APR40) leading to the system.

How many ppm does the water measure after use?

This water filtration for sink does not affect or reduce PPM or TDS.

If you want to deal with high TDS or PPM, you will want to check our Reverse Osmosis system: RCC7 & RO500.

Where can I find the replacement filter for CU-A4 and how often should I replace it?

The filter life is 6-12 months, depending on your source water quality and usage. You can find the replacement filter set here.

The order for installation is:

1st Stage: 5 Micron Sediment filter, PP.

2nd Stage: UF Hollow Fiber Membrane.

3rd Stage: KDF media.

4th Stage: Post Activated Carbon Filter.

I want to use an oil rubbed bronze faucet. Can I buy any one I want?

Yes, you can use any oil rubbed bronze faucet as long as is is an air-gap with 1/4" connections. For more details, please contact us at (678)261-7611 or open a ticket here.

Does this under sink water filtration system filter FPAS (the forever chemical)?

We would recommend a reverse osmosis system for better removal of FPAS.

Will this under sink water filter remove pfos and pfas?

Yes, CU-A4 has a Ultra Filtration unit that can filter both.

I have a coconut sensitivity. Is there a filter I can get to replace the fourth filter on the stage 4?

Unfortunately, we do not have a replacement for them. All of our carbon filters have a coconut shell.

Does this water filter under sink remove viruses?

No, this product won't remove viruses. To remove viruses and other micro-organisms we would recommend a UV sterilizer normally found on our Reverse Osmosis systems or our whole house UV sterilizer UVF55.

I have a iSpring 7 stage R/O system that needs to be replaced due to leaks. Can I install this water filter for sink in its place?

This CU-A4 is not a Reverse Osmosis water filter. It is also smaller than your 7 stage R/O system and is designed for under sink use. We want to make sure how your old water filtration system was mounted and connected. So it is recommended to contact us directly at (678)261-7611 (M-F 9-5 ET) or open a ticket here.

Does the under sink water filter system include the brushed nickel faucet (as shown) ?

Yes. This system does include a faucet but it is the chrome colored one shown.

What size space is needed to install? Height and depth?

Product Dimensions are 10.5 x 4.5 x 12.5 inches. I'd say around 16" x 16" undersink space is sufficient enough to install the CUA4. It's also best if you can mount it on the cabinet wall.

Can I remove one or more of the 4 filters and still run the system?

No, all of the filters have to be in place.

Why does this under sink filter system need three tubes going into the faucet? It seems very counterintuitive!

The faucet in this under the sink water filter system not only regulates the pressure but it also works as a one-way valve that prevents backflow. The main water first goes into the faucet where high water pressure is regulated before it comes back out to feed the system.

Is ther documentation that this undersink water filter will remove all uranium from my well water?

Only Reverse Osmosis systems are proven to remove Uranium from your tap water. If you have any questions, please contact us directly at (678)261-7611 (M-F 9-5 ET) or open a ticket here.

How affective is it on arsenic?

The 0.01 micron Ultra Filtration (UF) stage removes up to 99% of most problematic pollutants including arsenic.

Can it be connected to existing faucet, what is the flow rate in GPM?

No, this intended to be used on its own separate dispenser and can't be used with the existing kitchen faucet. The flow rate is about 0.5 to 0.9 gpm.

Does the under sink water system remove all of minerals from tap water?

No, this water filter is not designed to remove all minerals from tap water. If you want to remove most minerals in your water, you will want to check our Reverse Osmosis water filtration system, such as: RCC7 & RO500.

What is the average pH of the water after filtration?

This undersink water filter has very little impact in the pH of your water.