can this faucet be mounted in the Standard sprayer hole on sinks? (Approx 1 1/2 inch hole)

Can you, Yes. But the problem is that the base of this is just a tiny bit smaller the 1.25 inches. So it will NOT cover the hole completely since it is in an oval shape NOT round.

Can you change the filter without turning off the water?

Yes you can change the filter with the water on. When you twist the filter to remove an old one, it physically disconnects, then when you twist the new one in, water flow returns.

What does this water filter remove? Mercury?

The included EZ-1 filter (according to the manual) states chlorine, class 3 particulates, and Standard 42. ANSI Standard 42 is for chlorine(taste/odor), chloramines, iron, manganese, hydrogen sulfide, pH neutralization, and zinc reduction. Mercury would fall under Standard 53, which includes heavy metals (arsenic, cadmium, chromium, copper, lead, mercury, selenium), inorganics (fluoride & nitrate, nitrite) and volatile organic chemicals (chloroform surrogate). For these you need the EZ-3 filter.

At this level of filtering, would the water be equivalent to distilled water?

Only a "still" or distillery can make "distilled" water. If done correctly the water should be "chemically pure". Neither reverse osmosis (RO) nor any kind of filter will even come close!

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💧 Refresh your routine with premium purity—because your water deserves the best.

SEAMLESS COMPATIBILITY - Perfect fit for Culligan US-EZ-1, US-EZ-3, and US-EZ-4 systems—upgrade your hydration game.
LONG LASTING PERFORMANCE - Filters up to 500 gallons or 6 months of fresh water—whenever you need it.
EFFORTLESS EZ CHANGE DESIGN - Swap your filter in seconds—no tools, no mess, no downtime.
PREMIUM MULTI STAGE FILTRATION - Reduces chlorine, lead, mercury, cysts, and more for crisp, clean water.
CERTIFIED WATER QUALITY ASSURANCE - NSF/ANSI Standards 42 & 53 certified for taste, odor, and contaminant reduction.

The Culligan RC 4 EZ-Change Premium Water Filtration Replacement Cartridge delivers up to 500 gallons of clean, great-tasting water with a simple, tool-free installation. Certified to NSF/ANSI Standards 42 and 53, it effectively reduces chlorine, lead, mercury, cysts, and other contaminants while maintaining a steady flow rate of 0.5 gallons per minute. Compatible with multiple Culligan systems, this cartridge ensures hassle-free, long-lasting filtration for your home or office.

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Manufacturer	Culligan
Part Number	01019057
Product Dimensions	33.02 x 10.16 x 10.16 cm; 1.18 kg
Item model number	RC-EZ-4
Size	1 Pack
Colour	White
Style	Premium Filtration
Installation method	Under Sink
Item Package Quantity	1
Number of Pieces	1
Flow rate	0.5 Gallons Per Minute
Water Consumption	500 gallons
Certification	Chlorine Reduction
Special Features	Chlorine reduction, Multi-stage filtration, NSF Certified
Batteries included?	Yes
Batteries Required?	Yes
Item Weight	1.18 kg

Culligan RC 4 EZ-Change Premium Water Filtration Replacement Cartridge, 500 Gallons, White, 1 Pack

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