Heterotrophic Bacteria (Standard Plate Count) - Add-on To Test Kit Only (East)THIS IS AN ADD ON Product ONLY You must have a test kit in your cart to add this product to the test parameters. Also called Standard Plate Count, HPC, or SPC for short. This test is a procedure for estimating the number of live heterotrophic bacteria typically found in water. Heterotrophic bacteria are defined as bacteria that require organic compounds of carbon and nitrogen as a food source. This test is commonly used to estimate bacteria loading in