why do i need 150 of them?

Well, it's a matter of personal choice. I test frequentl, so I am happy there are 150 of them. The box that I just got doesn't expire until August of 2023, so I know I will have no problem using them by that time. I like to make sure my water softener is working.

Can it test bottled carbonated water?

I am sure it can. I would test the freshly opened bottle first, then let it stand overnight to lose the carbonation then test again to see if there was a difference. The stale water test should be considered definitive. I am a chemist.

ASIN	B08D8KFPV8
Best Sellers Rank	#35,591 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #522 in Diabetes Care
Brand	VARIFY
Brand Name	VARIFY
Customer Reviews	4.4 out of 5 stars 6,310 Reviews
Global Trade Identification Number	00618149116515
Item Weight	77 g
Manufacturer	VARIFY
Material	Magnesium
Material Type	Magnesium
Recommended Uses For Product	testing water hardness for water softeners, dishwashers, wells, spas, and pools
UPC	618149116515
Whats in the box?	150 strips

Premium Water Hardness Test Kit | Fast, Accurate Testing Strips for Softener, Dishwasher, Well, Spa, Pool | 150 Strips at 0-425 PPM | Calcium and Magnesium Total Hardness

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