NPC Pro

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 plaster finishes, this app simplifies the process with accuracy and ease.

Key Features:

- LSI Calculator – Quickly determine water balance to prevent scaling, etching, and plaster degradation.
- Water Chemistry Guide – Get precise recommendations for pH, alkalinity, calcium hardness, and more.
- Startup Procedures – Follow NPC’s step-by-step plaster startup guide for long-lasting, durable finishes.
- Easy Data Input – Enter key pool chemistry values and get instant LSI results.
- Professional-Grade Accuracy – Designed for pool contractors, service techs, and water chemistry experts.
- User-Friendly Interface – Simplifies complex calculations for effortless use on the job.
- Ask The Expert – If you have questions we have answers, use our ask the expert form to get answers to your toughest questions from the NPC community experts.
- Connect. Engage. Explore. In addition to the tools, NPC Pro offers you access to find members, stream podcasts, access technical resources, connect with NPC social media and more.
- Podcasts

Why Use the NPC Pro LSI Calculator & Guide?
Balanced water chemistry is crucial to maintaining a beautiful, durable swimming pool finish. The LSI Calculator ensures your water is within the ideal range, preventing costly repairs and extending the life of pool surfaces. The Startup Guide provides step-by-step instructions to correctly introduce new plaster finishes, avoiding common issues like discoloration or surface roughness.

Whether you’re a pool professional, service technician, or pool owner looking for precise water chemistry management, this app is your go-to tool!

Download the NPC Pro LSI Calculator & Startup Guide today and take the guesswork out of pool chemistry!

Pool Owners • Pool Professionals • Tech Resources • Education

Affiliations:

American Shotcrete Association
Independent Pool and Service Association
California Pool and Spa Association
The Association for Pool and Spa Professionals
American Concrete Institute
American National Standards Institute
Institute for Code Council

Our Mission
The National Plasterers Council will continue to be the utmost authority in the preparation, application, materials, start-ups and preservation of cementitious pool interior finishes. The NPC will collaborate with other associations and serve the industry through research, education, promotion, and certification of all segments of the pool industry including pool owners, the pool service providers, plasterers, manufacturers, specifiers, remodelers, architects, and builders.