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Questions and Answers for Watts Zero-Waste Under Sink Reverse Osmosis Water Filtration System

Internet #100203211

Model #ZRO-4

Store SKU #449959

  • Four-stage filtration system removes impurities from the water
  • Utilizes a reverse osmosis system to minimize waste
  • Not designed for use with tankless water systems

Questions & Answers

44Questions
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Q:Does it affect the water heater in any way?
by|Apr 11, 2021
1 Answer
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A:  Hi Anil, As long as the unit is 25ft or more from the heater you should not notice warm water at the RO unit. There will be a higher concentration of dissolved minerals in the water going back to the heater but with the typical 40-50 gallon water heater the dilution when in the tank should not be noticeable. Thank you

by|Jun 15, 2021
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    Q:I have a boiler that provides heat for our radiant heat and the side arm that holds our hot water. The side arm is 50 gallons and we never run out of hot water.
    by|May 9, 2020
    0 Answer
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    Q:What is the maximum distance, in feet, allowed between the tank and the RO faucet? I'd like to install in laundry room.
    by|May 6, 2020
    1 Answer
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    A:  Pat, thanks for reaching out! The unit comes with 4 ft of tubing between the unit and the tank and 4 ft of tubing between the unit and the faucet if you add more tubing you will reduce flow going to the faucet and risk the unit not being able to regulate pressure and shut down properly.

    by|Jul 22, 2020
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      Q:Says "Does not work with tankless water heaters." Does that include having a regular gas water heater and then a point of use temperature booster on the sink's hot water line?
      by|Mar 12, 2020
      2 Answers
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      A:  The limitation with this system is .5 gallons per minute into the 3 gallon storage tank. You would not want this system to feed any hot water supply basically, unless you added a much larger storage tank.

      by|Mar 25, 2020

        A:  Hi, Correct, this includes point of use temperature boosters, we would not recommend using this product with them. Best, Watts team

        by|Mar 13, 2020
          1 found this answer helpful
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          Q:Does it filter arsenic?
          by|Nov 13, 2019
          2 Answers
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          A:  Yes, it does filter arsenic.

          by|Apr 20, 2020
            2 found this answer helpful

            A:  Hi mzp, Yes, the long answer is below as well; but as you can see, the 3rd stage filters arsenic. Best, Watts team FOUR STAGE WATER FILTRATION: The ZeroWaste (R) RO System uses 4 Stages of Filtration; a 5 Micron Sediment (104017) traps particles like dirt, silt and rust; a 5 Micron Carbon (101009) reduces Chlorine, and chemicals that cause bad taste and odor; 24 GPD Membrane (560014) removes TDS, and contaminants such as Arsenic, Copper, Lead and Cysts; a Granular Activated Carbon InLine (560010) to remove any remaining chlorine or other chemicals that cause bad taste or odor before being dispensed

            by|Apr 20, 2020
              2 found this answer helpful
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              Q:Where else would it be sold
              by|Aug 15, 2019
              2 Answers
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              A:  Hi Linnea, You can find this at a variety of retailers, but as you're already on Home Depot, I would recommend using Home Depot for this item. Best, Watts team

              by|Sep 3, 2019

                A:  g o o g l e plumbing supply stores Undercounter RO units are sold all over and with dozens of options. Watts Premiere is top tier brand sold at many commercial plumbing supply stores.

                by|Mar 25, 2020
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                  Q:Does this system remove Salt? If so how much?
                  by|Nov 14, 2018
                  3 Answers
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                  A:  An RO removes 99.?% of anything in the water. Including fluoride, so much so, you have to use a mouthwash with fluoride to replace what is taken out of the water. Does it remove salt like from salt water in the ocean? I dunno, seems like a lot to ask. Does it remove the small amount of salt a water softener may add, without knowing for sure just cuz I'm a regular homeowner, I would say Most likely all of it. I have a water softener, I never taste anything but clean pure water. And again, An RO removes 99.?% of anything in the water. So it would just have to, I bet.

                  by|Feb 5, 2020
                    1 found this answer helpful

                    A:  RO is great at removing salt. In high end systems, they exchange salt ions for the chlorine, in the water. The chlorine is rinsed down the drain at the softner refresh. The salt is filtered out at the Reverse Osmosis fiter.

                    by|Mar 25, 2020

                      A:  Yes, salt is grouped in with the TDS reduction at 96.4%

                      by|Feb 5, 2020
                        1 found this answer helpful
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                        Q:Do you have to install the faucet?. I want to install this unit next to my refrigerator across from the sink. The refrigerator is where I get my drinking water and I want clean ice. I understand that the water pressure has to be correct.
                        by|Oct 12, 2018
                        2 Answers
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                        A:  We have ours connected to a Scotsman ice maker with no problems

                        by|Jul 13, 2023

                          A:  No you do not need the faucet if you want to plumb it directly to the refrigerator.

                          by|Mar 25, 2020

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                            Contaminants Filtered

                            Lead, Chlorine, Bacteria, Copper, Fluoride

                            Lead, Bacteria, Iron

                            Lead, Chlorine, Bacteria, Copper, Fluoride, Iron

                            Lead, Chlorine, Copper, Fluoride

                            House Hold Size

                            5-6 people

                            4-6 people

                            3-4 people

                            8+ people

                            Number of Stages

                            4 Stage

                            4 Stage

                            5 Stage

                            7 Stage

                            Filtration Method

                            Carbon Block, GAC, Sand

                            Carbon Block, Polypropylene, Ultraviolet Light

                            Carbon Block, Coconut Shell Carbon, Sediment

                            Alkaline or Calcite, Coconut Shell Carbon, GAC, Remineralizer, Sediment, Thin Film Composite Membrane

                            Number of filters included

                            4

                            1

                            5

                            4