Update app.py

app.py

@@ -743,7 +743,7 @@ class HydroCalculator:
         for element, value in ppm.items():
             if element in EC_COEFFICIENTS:
                 ec += value * EC_COEFFICIENTS[element]
-        return ec / 1000
+        return ec / 100
 
     def calculate_ec_exact(self):
         MOLAR_MASSES = {