Watts H2O-DWRO300 User Manual (English)

Questions and Answers:

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epowellAug 3, 2025
What to do if my Watts Water Filtration System is constantly running?
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  Kimberly SteeleAug 3, 2025
  If your Watts Water Filtration System is constantly running and won't shut off, it could be due to several reasons. Low water pressure can be a factor, so refer to solution #1 regarding water pressure. A crimp in the supply tube could also be the cause; inspect the tubing and straighten or repair it if needed. High water pressure could also be the problem; ensure that the incoming water pressure doesn't exceed 100 psi, and consider installing a pressure relief valve if necessary. Additionally, high or low pressure in the tank may be the issue. To resolve this, empty the storage tank and set the tank air pressure between 5-7 psi, using a digital air gauge for best results.
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Julie MartinAug 8, 2025
How to fix low water production in Watts Water Filtration Systems?
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  Courtney GonzalesAug 8, 2025
  If you're experiencing low or slow water production from your Watts Water Filtration System, several factors could be responsible. First, ensure you have a minimum of 35 psi incoming water pressure; if it's low, Watts sells a booster pump. Also, make sure the water supply is turned on and the feed water valve is fully open. Check for any crimps in the tubing and straighten or replace as needed. A clogged carbon block filter could be the culprit, so replace it. Lastly, a fouled reverse osmosis membrane might be the issue, so consider replacing the membrane.
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Kelly LewisAug 14, 2025
Why is my Watts Water Filtration System producing milky colored water?
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  Lisa MartinezAug 15, 2025
  If you notice milky colored water in your Watts Water Filtration System, it's likely due to air in the system. This is normal during the initial startup and should disappear within 1-2 weeks of normal use. If the issue recurs after a filter change, drain the tank 1 to 2 times.
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Laura HarrisonAug 21, 2025
What to do if there is water from the faucet vent hole or noise from drain in Watts Water Filtration Systems?
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  Charles TuckerAug 21, 2025
  If you're experiencing water coming from the faucet vent hole or noise from the drain of your Watts Water Filtration System, it could be due to a crimp or restriction in the drain line, or a clogged drain tube. Check the tubing and straighten or repair as necessary, ensuring all drain lines are straight and clear of blockages. Cut off any excess tubing. This issue can also be caused by a dishwasher or garbage disposal. Disconnect the 3/8" black line at the drain, clean it out with a wire, and then reconnect it. Note that simply blowing air through the line may not remove the clog.
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Tina HubbardAug 27, 2025
Why is there a small amount of water in the storage tank of my Watts Water Filtration System?
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  Rhonda MillerAug 27, 2025
  If you observe a small amount of water in the storage tank of your Watts Water Filtration System, it could be because the system is still starting up; it normally takes 3 hours to fill the tank. Low water pressure can also cause this, so refer to solution #1 regarding water pressure. Another potential cause is too much air in the tank. When the tank is empty of water, the air pressure should be 5-7 psi. If it's below 5 psi, add air; if it's above 7 psi, bleed air. Check only when the tank is empty.

Watts H2O-DWRO300 Specifications

General

Model Number	H2O-DWRO300
Filtration Stages	5
Membrane Type	Thin Film Composite (TFC)
Storage Tank Capacity	3.2 gallons
Product Type	Reverse Osmosis System
Filter Life	6-12 months (pre-filters), 2-3 years (membrane)
Included Filters	Sediment, Carbon Block, Reverse Osmosis Membrane, Post Carbon
Operating Temperature	40-100°F