About: The Freshwater Phosphate Test Strips allows you to test for phosphates in your hot tub water. Why is this important? If you have a salt system, it’s important to know if there are phosphates present in your water. If phosphates are present, this may not allow your salt cartridge to operate at optimal conditions. If phosphates are present in your water, please purchase our phosphate remover.

Compatible With: Freshwater Salt System.

IMPORTANT: Follow instructions exactly as they read on the bottle.