will to water my copper pipes when used for entire house

Well, RO water is a bit aggressive to copper however I have used a whole house RO system in all my homes for the past 40 years and never had an issue!

Could this handle water with a tds of 4000 mg/l?

Some of Dwayne's answer is correct and some of it is technically incorrect. The correct part isSome of Dwayne's answer is correct and some of it is technically incorrect. A water softener actually increases TDS slightly but is almost always necessary because the calcium, magnesium and iron it removes (hard water) WILL prematurely plug up a membrane while the sodium it puts back in the water to replace what it removed will not. The reverse osmosis membrane does the actual TDS reduction (not the water softener). As for the 4000 TDS, that is at or above the reach of many RO systems. If I were in your situation I would get a reliable method of testing the TDS as Dwayne was eluding to unless you are positive the 4000 number is correct and call the manufacturer with your results. Explain what you're trying to accomplish and the equipment you're planning to use including the size and type of water softener and pre filter you plan to use and see if they will agree that you are on the right path. If they say the water is too high in TDS for the equipment then Dwayne is right and you will be making a costly mistake. Also, based on the water I work with, TDS in that range goes hand in hand with water containing high sodium and chloride (salt). When this happens, the salt setting on the water softener needs to be set at the maximum level or it won't work properly. Another thing that often happens is that water with high salt generally has low hardness. If you have it tested and the hardness is low, say under 3 grains per gallon (51 ppm) you may be fine without a water softener, or a smaller system may be adequate. However, if there is any iron at all, it MUST be removed with a pre filter for ferric (oxidized) iron and a water softener or automatic backwashing iron filter for ferric and/or ferrous (dissolved iron). If either type of filter is used, install it before the water softener but if the automatic filter is used there is no need for the pre filter except there should be at least one 5 micron filter placed in front of the RO membrane if the system is not already equipped with one.

How hard is it to winterize, ie, drain the water so it doesn’t freeze?

Hi there, the system needs to be uninstalled and kept indoors to avoid freezing which may damage the plastic parts. Please reach out to our customer service team for additional questions. We're always ready to help. iSpring Water Systems, LLC

Will this system hand 3 faucets and a dishwasher?

providing you have adequate storage and do not exceed 300 G per day total usage for these, it will. I have 90 gal storage and it handles my entire house hot water usage including washing machine and dishwasher. I have, however, only one could water facet connected to it for drinking and cooking water. In other facets, it mixes with "untreated" cold water still lowering its TDS etc. by default. Do not see much reason to wash my hands or flush toiltes with RO treated water.

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iSpring RCB3P Tankless Reverse Osmosis RO Water Filtration System, 300 GPD RO System, Reduces TDS, 1.5:1 Pure to Drain, Booster Pump & Pressure Gauge for Residential & Light Commercial Use

iSpring RCB3P Tankless Reverse Osmosis RO Water Filtration System, 300 GPD RO System, Reduces TDS, 1.5:1 Pure to Drain, Booster Pump & Pressure Gauge for Residential & Light Commercial Use

Product ID: 6738217

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Details

Brand
iSpring
Special Feature
Filters parts
Product Dimensions
19.5"L x 11"W
Package Information
Tank
Power Source
Ac
Item Weight
52 Pounds

💧300 GPD ultra-pure output

📈Built-in booster pump & pressure gauge

⚙️1.5:1 pure-to-drain efficiency

Description

💧 Elevate your water game with pro-grade purity and efficiency!

PURIFY LIKE A PRO - Removes 99%+ of 1,000+ contaminants including PFAS, lead, chlorine & more for crystal-clear water.
TANKLESS EFFICIENCY - Innovative 1.5:1 pure-to-drain ratio saves water and boosts sustainability.
SMART PRESSURE CONTROL - Integrated booster pump and pressure gauge optimize flow and filtration speed.
POWER PACKED PERFORMANCE - 300 gallons per day capacity keeps your home or office hydrated without compromise.
BUILT TO LAST EASY TO INSTALL - Durable stainless steel frame with metal bracket for hassle-free setup and maintenance.

The iSpring RCB3P is a high-capacity, tankless reverse osmosis water filtration system delivering up to 300 gallons of purified water daily. It removes over 99% of more than 1,000 contaminants including PFAS, lead, and chlorine, featuring a 1.5:1 pure-to-drain ratio enhanced by a built-in booster pump and pressure gauge. Designed for residential and light commercial use, its durable stainless steel frame ensures easy installation and long-lasting performance.

Specifications

Brand	iSpring
Special Feature	Filters, parts and tubing, Reduce TDS, Tankless
Product Dimensions	19.5"L x 11"W x 28"H
Package Information	Tank
Power Source	Ac
Item Weight	52 Pounds
Model Name	RCB3P
Lower Temperature Rating	40 Degrees Fahrenheit
Upper Temperature Rating	100 Degrees Fahrenheit
Supported Water TDS Level Maximum (PPM)	2000
UPC	662425023554 662425048076
Global Trade Identification Number	00662425023554
Manufacturer	iSpring Water Systems,LLC
Part Number	RCB3P
Item Weight	52 pounds
Item model number	RCB3P
Size	300 GPD RO
Color	Blue
Style	300 GPD RO
Voltage	110 Volts
Item Package Quantity	1
Number Of Pieces	1
Special Features	Filters, parts and tubing, Reduce TDS, Tankless
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 year limited warranty

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