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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CO-Z 4L Brushed Stainless Steel Countertop Distiller Machine, Home Distilled Water Maker with Glass Pot, Purifier to Make Clean Water

Product ID: 62119140

Details

Brand
CO-Z
Capacity
4 Liters
Included Components
1 x Distiller
Installation Type
Countertop
Material
Stainless
Package Information
Bottle

⚡750W fast heating power

💧0.3 gallons purified per hour

🛡️304 stainless steel durable build

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Description

💧 Elevate your hydration game with pure, professional-grade distilled water!

SMART SAFETY - Auto shut-off at 302°F prevents overheating, giving you peace of mind during every cycle.
BUILT TO LAST - Robust 304 stainless steel body with powder-coated finish ensures long-term durability and style.
PURE POWERHOUSE - 750W heating element delivers rapid distillation for fresh, clean water on demand.
EFFORTLESS MAINTENANCE - Includes cleaning powder and design features that minimize scale buildup, keeping your distiller pristine.
PRECISION PURIFICATION - Filters down to 2 PPM, removing VOCs and impurities for the purest hydration experience.

The CO-Z 4L Brushed Stainless Steel Countertop Distiller is a high-efficiency 750W water purifier that produces up to 0.3 gallons of ultra-pure distilled water per hour. Designed with a durable 304 stainless steel container and advanced safety features like automatic shut-off at 302°F, it ensures safe, reliable operation. Ideal for home, office, and specialized uses such as CPAP machines and aquariums, this distiller offers easy maintenance with included cleaning powder and fast heat dissipation technology for quicker cycles.

Specifications

ASIN	B078GHJ921
Best Sellers Rank	#48,469 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #45 in Pitcher Water Filters
Brand Name	CO-Z
Capacity	4 Liters
Container Type	Bottle
Customer Reviews	4.1 4.1 out of 5 stars (4,473)
Included Components	1 x Distiller, 1 x glass bottle, 3 x carbon packs , 1x citric acid
Installation Type	Countertop
Item Dimensions L x W x H	12.4"L x 11"W x 18.8"H
LowerTemperature Range	68 Degrees Fahrenheit
Manufacturer	CO-Z
Material Type	Stainless Steel
Maximum Flow Rate	1 Liters Per Hour
Model Name	DWD-BRSS-00
Model Number	DWD-BRSS-00
Other Special Features of the Product	Fast Heat Dissipation, Overheating Protection, Reduce TDS
Part Number	DWD-BRUS-00
Power Source	Corded Electric
Purification Method	Distillation
Smart Home Compatibility	Not Smart Home Compatible
Supported Water TDS Level Maximum (PPM)	2
Unit Count	1.0 Count
Upper Temperature Rating	300 Degrees Fahrenheit

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