Question 1

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

Accepted Answer

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.

Question 2

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

Accepted Answer

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.

Question 3

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

Accepted Answer

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.

Question 4

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

Accepted Answer

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

ASIN	B078GHJ921
Best Sellers Rank	#60,483 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #56 in Pitcher Water Filters
Brand Name	CO-Z
Capacity	4 liters
Container Type	Bottle
Customer Reviews	4.1 4.1 out of 5 stars (4,495)
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

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

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