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 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 average is about 1100 gallons, but this number may not represent your source water, so individual results could either be more or less than the average.

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

Per Josh @ iSpring 3/7/2017 - this will not remove minerals present in your city's tap water, so there should be little difference in total dissolved solids (TDS) count.

Can I connect existing water line(previously connect to refrigerator,tiny size) to this unit or I have use a adaptor? and can I only connect to refrig

I answered this before, but after re-reading your question I need to revise my original answer. If you are planning on using this as a primary filtered water supply you will probably find that there is not enough water flow through the original water line that is supplying water to your refrigerator. Maximum flow rate is a function of the diameter of the supply line (among other factors). You could make it work if you had to, but I am thinking the flow rate might be kind of feeble. Why not take the supply from under the sink in the kitchen?

Does this remove flouride?

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

Ispring Cu A4 4 Stage Ultra Filtration Under Sink Water

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Description

💧 Elevate your tap water game—pure, powerful, and effortlessly pristine!

SLEEK SAFE DESIGN - Premium brushed nickel faucet with NSF/ANSI certified, lead-free, BPA-free materials.
EFFORTLESS MAINTENANCE - Twist-on filter cartridges and push-to-connect fittings make replacements a breeze.
CRYSTAL CLEAR HYDRATION - Removes 99%+ chlorine, lead & contaminants while preserving essential minerals.
NEXT LEVEL FILTRATION TECH - Advanced 4-stage system with ultrafiltration, KDF, GAC & activated carbon for superior purity.
ZERO WASTE MAXIMUM EFFICIENCY - No wastewater or storage tank needed—eco-friendly and space-saving design.

The iSpring CU-A4 is a cutting-edge 4-stage under-sink water filtration system featuring a 0.01 micron ultrafiltration membrane that removes over 99% of chlorine, lead, arsenic, and other contaminants without stripping beneficial minerals. Its compact, no-waste design includes a premium brushed nickel faucet and easy twist-on filter replacements, delivering up to 8,000 gallons of clean water with NSF/ANSI certified safety and a 6-12 month filter lifespan.

Specifications

ASIN	B009AEJWZG
Best Sellers Rank	#6,316 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #19 in Under-Sink & Countertop Filtration
Brand	iSpring
Brand Name	iSpring
Capacity	8000 gallons
Container Type	Faucet
Customer Reviews	4.6 out of 5 stars 7,315 Reviews
Filter Life Cycle	6 months
Global Trade Identification Number	00662425053063
Included Components	Under sink water filter system, parts and tubings, faucet
Installation Type	Under Sink
Item Dimensions L x W x H	10.63"L x 4.33"W x 12.6"H
Item Highlight	0.01μm, Space-saving, Reduces 99.99% Contaminants, Quick Filter Change, With Brushed Nickel Faucet, Up to 12 Months
Item Type Name	4-Stage High Capacity Premium Under Sink Drinking Water System with 0.1 micron Ultra Filtration membrane
Item Weight	2 kg
LowerTemperature Range	40 °F
Manufacturer	iSpring
Material	0.01μm Ultra-Filtration, Lead-free & BPA-free Material, Leak-Free, Space-Saving & Easy to Install Material 0.01μm Ultra-Filtration, Lead-free & BPA-free Material, Leak-Free, Space-Saving & Easy to Install See more
Material Type	0.01μm Ultra-Filtration, Lead-free & BPA-free Material, Leak-Free, Space-Saving & Easy to Install
Model Name	CU-A4
Model Number	CU-A4
Number of Items	1
Number of Packs	1
Other Special Features of the Product	4-Stage 0.01 micron ultra-filtration, Heavy Duty, Leak Proof, Reduces chlorine, lead, arsenic, odor, metal and more
Part Number	CU-A4
Power Source	No Need
Product Dimensions	10.63"L x 4.33"W x 12.6"H
Purification Method	Mechanical Filtration, Chemical Absorption, Redox, and Ultrafiltration
Special Feature	4-Stage 0.01 micron ultra-filtration, Heavy Duty, Leak Proof, Reduces chlorine, lead, arsenic, odor, metal and more Special Feature 4-Stage 0.01 micron ultra-filtration, Heavy Duty, Leak Proof, Reduces chlorine, lead, arsenic, odor, metal and more See more
UPC	662425053063
Unit Count	1 Count
Upper Temperature Rating	100 °F
Warranty Description	30-Day money-back guarantee. 1-Year Manufacturer Warranty. Lifetime support from Atlanta, GA.

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iSpring CU-A4 4-Stage Ultra Filtration Under Sink Water Filter System

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Description

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