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About: NPC Pro LSI Calculator & Startup Guide – The Ultimate Water Chemistry Tool for
Pool Professionals! Developed by the National Plasterers Council (NPC), the NPC
Pro LSI Calculator & Startup Guide is the essential app for pool professionals,
technicians, and service providers. Whether you’re calculating the Langelier
Saturation Index (LSI) to ensure balanced water chemistry or following proper
startup procedures for new plas.


 
  2026-02-15

NPC Pro Customer Service 💢

The following contact options are available: Pricing Information, Support, General Help, and Press Information/New Coverage (to guage reputation). Discover which options are the fastest to get your customer service issues resolved.



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E-Mail: [email protected]

Website: 🌍 Visit NPC Pro Website

Privacy Policy: https://www.nationalplastererscouncil.com/privacy-policy/

Developer: NPC - National Plasterers Council







3 Most reported problems 😔💔

5.0 out of 5

Not for testing pools!

2025-03-22

by Dr. Adjustment

This app is not designed to calculate any sort of pool treatment ( not like google recommends), it only displays the end condition of your water chemistry based on the input values your give it.
It wides not tell you chemicals to add to bring your pool back to a (clear water) state.

Doesn’t work on iPhone

2025-03-23

by Hjsjfnekzknrjxjdwjj

Input boxes are stacked on top of each other. Can’t use

Great App

2025-03-24

by Trav2001

I own a pool service company in AZ and I use this app all the time to get my LSI readings at each pool. Even though it doesn’t give you suggested amounts of chems to use to adjust the numbers that’s ok for now, although I’d like to see that calculator on here someday. It’s dead in accurate every time.




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