Will this work on well water?

It will work on any type of water. Well, city, salt. If it has nitrates in it this checker will see them. Only complaint is it doesn’t come with a lot of reagent packs and they are hard to come by currently. But it is absolutely a great investment for accuracy and peace of mind.

Can I add some marine salt to my freshwater sample to make this work for freshwater?

Go on to Reef2reef discussion boards and direct your question to Randy Holmes Farley he's the chemist. He usually gets back to you fairly quickly. My honest answer though, you'd be better off with Tetra strips. They're plenty accurate enough for fresh water applications and cheap enough.

ASIN	B098H54LH5
Best Sellers Rank	#125,557 in Pet Supplies ( See Top 100 in Pet Supplies ) #405 in Test Kits
Item Weight	0.29 g
Item model number	HI782
Manufacturer	Hanna Instruments
Net Quantity	1.0 Count
Package Dimensions	19.2 x 12.6 x 6.71 cm; 0.29 g

Hanna Instruments High Range Nitrate Checker HI782

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