Shalom All, I work with Unto, a christian non-profit serving in LMI countries, what would you recommend for a biological testing kit that would be affordable and sustainable for purchasing for a non-profit company?

Hello @Hichul Chung11 

What is your objective? 

• Identify an appropriate drinking water source?
• Assess the effectiveness of a household water treatment technology? 
• Monitor compliance with standard and regulations? 
• Increase user awareness on water quality issues?
• Check if a borehole has been properly disinfected?

Based on your objective, there are different options to consider: Presence-Absence - (H2S, other culture media), Most Probable Number, Membrane filtration. 

Let me know your objectives, and we can recommend the appropriate options.