Is it possible 1) to exchange the metal tank for a food grade plastic one of the same capacity and 2) add a UV filter to this system?

Dear Valued CustomerYes you can add UV to the system and about the tank we do not carry the plastic tank any more but let me give you some info about the tank Inside the tank is a bladder made of a material called butyl. Water does not touch the metal or plastic shell of the tank. It touches only the butyl bladder and spout (usually stainless steel or hard plastic) as it enters or leaves the tankA synthetic rubber, or Elastomer, butyl rubber is impermeable to air and used in many applications requiring an airtight rubberThis RO tank has been tested and certified by NSF International under NSF/ANSI Standard 58 for material and structural integrity.Best Regards

How do you know it is time to change the filters?

@Climers got it right. Most of the other answers are not, in that they suggest you to change filters AFTER you have detected something wrong at the output. Well, by that time, your RO membrane is kaput - no good any more. RO membranes are very sensitive to chlorine; so you must change your 3 front-line filters (1 sediment and 2 carbon) before they start to leak chlorine to the membrane. Doing so will prolong your membrane's life for many years. I have had a system working perfectly after 8+ years of continuous service, just by changing the first 3 filters regularly (yearly).

I just ordered the filter system, do you sell extra complete sets of the filters?

Yes, You can also get them at Walmart, Home Depot, Etc if you live where there is one.

What is the dimension of the manifold?

13" wide, 16" high, 6" deep. the tank if 12" in dia and 16" high

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Express Water RO5DX 5-Stage Under Sink Reverse Osmosis Water Filter System, NSF Certified 372 & 58, 50 GPD, Reduces 99% of Impurities, Deluxe Chrome Faucet

Product ID: 7828266

Details

Brand
EXPRESS WATER
Capacity
4 gallons
Included Components
RO5DX Extra
Item Weight
31 Pounds
Material
Brass Faucet
Package Information
Tank

💧50 GPD ultra-pure flow

🔧5-stage NSF certified filtration

🚰Deluxe chrome faucet, 0.8 GPM

S$688

Duties & taxes included

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Description

🚰 Drink like a boss: Pure water, zero compromises.

PURE POWERHOUSE - Reduces 99.99% of contaminants including lead, fluoride, PFAs, and chlorine for water that’s truly clean.
COMPACT VERSATILE - Fits neatly under any sink with a sleek chrome faucet, perfect for homes, offices, and even RVs.
ECO CHIC FILTRATION - Coconut carbon filters deliver crisp, natural taste while being environmentally responsible.
LEAK PROOF CONFIDENCE - Built-in emergency leak detector automatically stops water flow to protect your home from unexpected drips.
EFFORTLESS INSTALLATION - Quick-connect tubing and under-sink design means no plumber needed—get pure water fast and hassle-free.

The Express Water RO5DX is a 5-stage under-sink reverse osmosis system certified to NSF standards 372 & 58, delivering up to 50 gallons per day of ultra-purified water. It reduces 99.99% of harmful impurities including lead, fluoride, and PFAs, featuring a deluxe chrome faucet with 0.8 GPM flow. Designed for easy DIY installation with quick-connect tubing and equipped with an emergency leak detector, this compact system fits under most sinks and includes eco-friendly coconut carbon filters for superior taste. Ideal for residential, office, and mobile use, it offers a reliable, high-capacity water purification solution without the need for electricity.

Specifications

ASIN	B00J2DGTD8
Best Sellers Rank	#6,394 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #13 in Under-Sink & Countertop Filtration
Brand Name	EXPRESS WATER
Capacity	4 gallons
Container Type	Tank
Customer Reviews	4.6 4.6 out of 5 stars (6,171)
Global Trade Identification Number	00705332529235
Included Components	RO5DX, Extra Filter Set, Owners Manual
Item Dimensions L x W x H	14"L x 5"W x 15"H
Item Type Name	NSF Certified 5 Stage RO Water Filter System with Faucet and Tank – Under Sink Water Filter – plus 4 Filters – 50 GPD
Item Weight	31 Pounds
LowerTemperature Range	39 Degrees Fahrenheit
Manufacturer	Express Water
Material Type	Brass Faucet, Plastic System, Steel Tank
Maximum Flow Rate	0.8 Gallons Per Minute
Model Name	Reverse Osmosis Water Filtration System –
Model Number	RO5DX
Other Special Features of the Product	Reduce TDS
Part Number	RO5DX
Power Source	No Power Needed
Purification Method	Reverse Osmosis
Smart Home Compatibility	Not Smart Home Compatible
Supported Water TDS Level Maximum (PPM)	300
UPC	705332529549 705332529235
Unit Count	1.0 Count
Upper Temperature Rating	100 Degrees Fahrenheit

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