”Water Indices" - Aggressive Index Water Test for Well or City Water with Corrosivity (LSI) Check - Add-on To Test Kit Only (West)THIS IS AN ADD ON Product ONLY You must have a test kit in your cart to add this product to the test parameters. Note: The Corrosion Check Test Kit and Problem Check Kit includes an aggressive index test and LSI Corrosivity Test Test Includes: Analysis that calculates the level of aggressiveness of water based on the total alkalinity, pH, and calcium hardness. Analysis that calculates the degree of saturation of water with respect to calcium carbonate