My understanding is distilling removes just about all the impurities. So what's the point of the charcoal post-filters?

Don't worry about it too much. My city tap water is 304 ppm. Distilled consistently without charcoal 4ppm. Distilled with charcoal - higher as the charcoal disintegrates. First 4 liters showed 178 ppm - The charcoal in it. Did 2 more 4 L batches, and it got down to 20 ppm. Removed the charcoal and consistently get 4 ppm. if you get one, process 4 liters and remove the filter and set it on something white for 2 minutes. Pick it up, and you will see the black charcoal residue on whatever you set it on, full of crud from your water, and that is what you drink. Nobody will convince me that some of the crud isn't released from the charcoal in your stomach. The point is that this is incredibly neat and healthy. 4 ÷ 304 = 1.3% trash remaining in the water. 98.7% of the trash is removed.

What is the approximate cost per gallon for making distilled water with one of these machines, not including the cost of the machine?

It uses 750 watts and it takes about 4 hours to distill a gallon. That means it uses 3000 watt-hours, or 3 kwh per gallon. So multiply that 3 kwh times your electricity cost to get your cost per gallon. If it's low like the midwest (8-10 cents/kwh), a gallon might only cost $0.25, or if it's higher like CA or MA ($0.28/kwh) it might be on the order of $1 per gallon.

Do you have to be present after four hours to shut it off or can you leave the house while it’s running ?

No, you do not have to be present to shut off the distiller, the unit has a built in reset safety that will turn off the distiller when it empties.

The lid does get calicum build up and there is no instruction how to clean it. so what do i do?

I use citric acid. You can buy in the canning section of the grocery store or in bulk on Amazon.

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Description

💧 Elevate your water game with pure, powerful distillation.

SMART SAFETY ZERO WORRIES - Automatic shut-off at 302°F prevents overheating, ensuring safe, hassle-free operation.
PURE HYDRATION NO COMPROMISE - Delivers 1.5 liters of crystal-clear distilled water every hour, perfect for your health and tech needs.
VERSATILE PURITY FOR EVERY SPACE - Ideal for home, office, dental clinics, and even your coffee machine or aquarium—because pure water matters everywhere.
BUILT TO LAST DESIGNED TO IMPRESS - Durable 304 stainless steel interior and sleek white exterior blend longevity with modern style.
EFFORTLESS MAINTENANCE ENDLESS FRESHNESS - Includes cleaning powder and clear instructions to keep your distiller running flawlessly for years.

The CO-Z Distilled Water Maker is a 1-gallon (4L) countertop distiller that produces 1.5 liters of pure distilled water per hour using a 750W heater. Featuring a corrosion-resistant 304 stainless steel interior and an automatic shut-off safety feature at 302°F, it ensures safe, efficient purification. Perfect for home, office, and specialized uses like CPAP machines and aquariums, it combines durability, style, and easy maintenance for consistently fresh, contaminant-free water.

Specifications

Brand	CO-Z
Special Feature	Automatic Shut-Off, Fast Heat Dissipation, Reduce TDS
Product Dimensions	27.9L x 25.4W x 47.6H Centimeters
Package Information	Pitcher
Installation Type	Freestanding
Power Source	Battery Powered
Item Weight	9.65 Pounds
Model Name	DWD-ZB01
Maximum Flow Rate	1.5 Liters Per Hour
Operating Pressure Range	50-60 Hz
Upper Temperature Rating	300 Degrees Fahrenheit
Supported Water TDS Level Maximum (PPM)	6
Manufacturer	CO-Z
Model number	DWD-ZB01-00-BAMZN-1
Colour	White
Number of Memory Sticks	1
Item Weight	4 kg 380 g
Item model number	DWD-ZB01-00-BAMZN-1
Voltage	120 Volts (AC)
Wattage	750 Watt Hours
Are batteries included?	No

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