Great tool
If you need to know compatibility of piping systems with different chemicals this is a great tool from Harrington.
Not enough ratings yet to assess Harrington's Chemical Guide.
Harrington's Chemical Guide appears legitimate, with a few gaps. AppsHunter Legitimacy Score for Harrington's Chemical Guide is 73/100.
Based on 73 of 100 points across 7 verification signals from App Store and developer data.