What is the source of the calcium used in your filter? Is it calcite or something else?

This is the answer I received from Waterdrop to a similar question: Our MNR filter includes 18 kinds of natural mineral stone materials: Subsurface rocks like Serpentine, sea pumice, Anorthite, Zinc Spinel, Bioclastic limestone, Baimo Dolomite, Magnetite, Wollastonite, Clinoptilolite, Volcanic Stone Shallow underground rock: like Kunlun Hetian Complex Rock, Marl, Clinoptilolite, Kaolin Ore, Tourmaline Deep underground rock: like Tianshan Maifan Stone, Potassium Feldspar, Basalt The above combination of stone materials is a scientific formula to simulate the environment of the best natural spring water that benefits human health. Please allow me to explain that our MNR filter includes 18 kinds of natural mineral stone materials: a. Subsurface rock like Serpentine, sea pumice, Anorthite, Zinc Spinel, Bioclastic limestone, Baimo Dolomite, Magnetite, Wollastonite, Clinoptilolite, Volcanic Stone b. Shallow underground rock: like Kunlun Hetian Complex Rock, Marl, Clinoptilolite, Kaolin Ore, Tourmaline c. Deep underground rock: like Tianshan Maifan Stone, Potassium Feldspar, Basalt The above combination of stone materials is a scientific formula to simulate the environment of the best natural spring water that benefits human health.

How much will this raise the ph level? At .50gpm(waterprop to system)

They sell an Alkaline filter, that will raise ph more, not this one.. All these other answers are wrong, talking about tds. Tds is total dissolved solids, that is not Physical hardness(ph) tds measures minerals in water. Ph measures the acid level in water. 2 totally different things. This filter is for adding minerals back not really raising ph so you can have Alkaline water.

Has anyone cut this open after use to see what remains? i couldn't tell by taste if anything is even happening. time to buy a tds tester.

TDS testers are a must have and are cheap.

How do you know that this isnt just adding arsenic and heavy metals back into the water?

Hi, Thanks for your interest in our MNR filter product. Please rest assured that only beneficial mineral will be added into the filtered water, and we use natural mineral rocks as source, so there will be no heavy metal releasing into the water, thank you. If you have contacted us via email but received no reply, please check the Spam/Junk Folder first. Thank you. If you have any other inquiries, please feel free to contact us. 1-888-352-3558 Kind Regards Mia Lauren Customer Service Rep

Material	pp cotton
Product Dimensions	2.6"D x 2.6"W x 11"H
Item Weight	12.64 ounces
External Testing Certification	RoHS
Product Benefits	Restore Essential Minerals
Brand	Waterdrop
Set Name	Quick Connect
Unit Count	1.0 Count
Number of Items	1
Manufacturer	Waterdrop
Part Number	WD-MNR35
Item Weight	12.6 ounces
Item model number	WD-MNR35
Size	1 Count (Pack of 1)
Color	White
Style	1 Mineral Filter
Item Package Quantity	1
Special Features	This RO remineralization filter is able to last 9-12 months
Included Components	Bracket, WD-MNR35 Mineral Filter
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 year manufacturer and Seller Combination

Remineralization Filter WD-MNR35, 1/4" Quick Connect Mineral Filter for Reverse Osmosis System, Restore Essential Minerals for RO System, RO Mineral, Under Sink Water Filtration

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