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

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💧 Elevate your tap game with ultra-pure water on demand!

SLEEK SAFE DESIGN - Premium brushed nickel faucet with NSF/ANSI certified, lead-free, BPA-free materials for peace of mind.
EFFORTLESS MAINTENANCE - Push-to-connect fittings and twist-on/off filters make replacements a breeze—no plumber needed.
CRYSTAL CLEAR HYDRATION - Removes 99.99% contaminants including chlorine, lead & arsenic without stripping essential minerals.
NEXT LEVEL FILTRATION TECH - 4-stage system with ultrafiltration, KDF, GAC & activated carbon for superior water purity.
ZERO WASTE FULL EFFICIENCY - Tankless design means no wastewater and instant access to fresh, filtered water.

The iSpring CU-A4 is a tankless, 4-stage under-sink water filter system featuring a 0.01 micron ultrafiltration membrane that removes 99.99% of contaminants like chlorine, lead, and arsenic while retaining beneficial minerals. It includes KDF and GAC filters for enhanced contaminant control, a premium brushed nickel faucet, and easy twist-on/off filter replacements, all built with NSF/ANSI certified, lead-free, and BPA-free materials. Designed for zero wastewater and quick installation, it delivers up to 500 gallons of clean water without the bulk of a storage tank.

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Brand	iSpring
Model Number	CU-A4
Color	White
Product Dimensions	26.67 x 11.43 x 31.75 cm; 2 kg
Capacity	500 Gallons
Material	Lead-free & BPA-free Material
Special Features	4-Stage 0.01 micron ultra-filtration, Remove chlorine, lead, arsenic, odor, metal and more
Item Weight	2 Kilograms

iSpringCU-A4 0.01μm Ultra-Filtration Under Sink Water Filter System, Tankless 4-Stage High Capacity, Remove 99.99% Contaminants, Quick Filter Change with Brushed Nickel Faucet, White

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